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Work a cold case alongside investigator Sheryl “Mac” McCollum, Director of the Cold Case Investigative Research Institute. Every week, Sheryl dives into her cold case files alongside accomplished guests to look for clues into unsolved murders, missing people, and more. This ain’t just a podcast but a war room. Sheryl opens her cold case files, her heart and her little black book! You will quickly realize Zone 7 is not a place but a lifestyle!

Work a cold case alongside investigator Sheryl “Mac” McCollum, Director of the Cold Case Investigative Research Institute. Every week, Sheryl dives into her cold case files alongside accomplished guests to look for clues into unsolved murders, missing people, and more. This ain’t just a podcast but a war room. Sheryl opens her cold case files, her heart and her little black book! You will quickly realize Zone 7 is not a place but a lifestyle!

Zone 7 with Sheryl McCollum

Introducing: Zone 7 with Sheryl McCollum

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/c4ce65c3-7fe3-4d81-a4bb-af6a0133fb85/transcript

A late-night stop at a Dairy Queen led to one of the biggest stories of Dale Cardwell’s career.

In this episode of "Zone 7," Sheryl McCollum talks with Dale about the investigation that uncovered corruption inside the DeKalb County Sheriff’s Office, exposed deputies working on the clock for Sidney Dorsey, and helped fuel a political shakeup that ended in the murder of Sheriff-elect Derwin Brown.

Dale shares how the story unfolded, the danger it brought to his own family, and the break that finally helped tie the killing back to Sidney Dorsey.

Guest Bio:

Dale Cardwell is a six-time Emmy Award-winning journalist, consumer investigator, and founder of TrustDALE. He is known for helping expose scams, political corruption, and government waste.

He teamed up with Clark Howard and now hosts Inside Investigations, which airs on more than 100 television markets nationwide.

About the Host

Sheryl “Mac” McCollum is an active crime scene investigator for a Metro Atlanta Police Department and the director of the Cold Case Investigative Research Institute, which partners with colleges and universities nationwide. With more than four decades of experience, she has worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing.

Her work on high-profile cases include The Boston Strangler, Natalie Holloway, and Tupac Shakur. Her work on the Moore’s Ford Bridge lynching led to her Emmy Award for “CSI: Atlanta” and induction into the National Law Enforcement Hall of Fame in 2023.

Social Links:

Email: coldcase2004@gmail.com

X: @zone7squad

Facebook: @sheryl.mccollum

Instagram: @officialzone7podcast

Preorder Sheryl’s upcoming book, "Swans Don’t Swim in a Sewer: Lessons in Life, Justice, and Joy from a Forensic Scientist," releasing May 2026 from Simon and Schuster.

Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire.

Highlights:
(0:00) Sheryl McCollum introduces Dale Cardwell and the Dairy Queen stop that led to one of DeKalb County’s biggest corruption cases
(1:15) Dale explains the system he built after years of consumer reporting, focused on helping consumers avoid scams
(3:30) Deputies are accused of clocking in at the jail while working private security for Sheriff Sidney Dorsey
(6:15) Surveillance, inside sources, and an open-records request lead to the first major break in the story
(9:30) The reporting lands just before the election and helps shift attention toward challenger Derwin Brown
(12:30) The corruption picture widens with allegations involving sexual harassment and sex-for-favors allegations, fake badges, and inmate labor
(15:00) Dale recalls the night police came to his door after Derwin Brown was murdered
(19:00) Dale learns he is also believed to be on the hit list, and he and his family are placed under protective custody
(23:30) An interview moment raises new questions about Sidney Dorsey’s knowledge of the conspiracy
(27:15) A witness’s note on a napkin helps lead investigators back to the murder plot
(28:30) Patrick Cuffy describes Dorsey giving the kill order on paper, then tearing it up and swallowing it
(33:30) Dale reflects on the cost of the case and his bond with the Brown family

 

 

A late-night stop at a Dairy Queen led to one of the biggest stories of Dale Cardwell&rsquo;s career.
In this episode of "Zone 7," Sheryl McCollum talks with Dale about the investigation that uncovered corruption inside the DeKalb County Sheriff&rsquo;s Office, exposed deputies working on the clock for Sidney Dorsey, and helped fuel a political shakeup that ended in the murder of Sheriff-elect Derwin Brown.
Dale shares how the story unfolded, the danger it brought to his own family, and the break that finally helped tie the killing back to Sidney Dorsey.
Guest Bio:
Dale Cardwell is a six-time Emmy Award-winning journalist, consumer investigator, and founder&nbsp;of TrustDALE. He is known for helping expose scams, political corruption, and government&nbsp;waste.
He teamed up with Clark Howard and now hosts Inside Investigations, which airs on&nbsp;more than 100 television markets nationwide.
About the Host
Sheryl &ldquo;Mac&rdquo; McCollum&nbsp;is an active crime scene investigator for a Metro Atlanta Police Department and the director of the Cold Case Investigative Research Institute, which partners with colleges and universities nationwide. With more than four decades of experience, she has worked on thousands of cold cases using her investigative system,&nbsp;The Last 24/361, which&nbsp;integrates evidence, media, and advanced forensic testing.
Her work on high-profile cases include The Boston Strangler, Natalie Holloway, and Tupac Shakur. Her work on the Moore&rsquo;s Ford Bridge lynching led to her Emmy Award for &ldquo;CSI: Atlanta&rdquo; and induction into the National Law Enforcement Hall of Fame in 2023.
Social Links:
Email: <a href="mailto:coldcase2004@gmail.com">coldcase2004@gmail.com</a>
X: @zone7squad
Facebook: @sheryl.mccollum
Instagram: @officialzone7podcast
Preorder <a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-Mac-McCollum/9798895652824">Sheryl&rsquo;s upcoming book</a>, "Swans Don&rsquo;t Swim in a Sewer: Lessons in Life, Justice, and Joy from a Forensic Scientist," releasing May 2026 from Simon and Schuster.
Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire.
Highlights:
<ul>
<li>(0:00) Sheryl McCollum introduces Dale Cardwell and the Dairy Queen stop that led to&nbsp;one of DeKalb County&rsquo;s biggest corruption cases</li>
<li>(1:15) Dale explains the system he built after years of consumer reporting, focused on&nbsp;helping consumers avoid scams</li>
<li>(3:30) Deputies are accused of clocking in at the jail while working private security for&nbsp;Sheriff Sidney Dorsey</li>
<li>(6:15) Surveillance, inside sources, and an open-records request lead to the first major&nbsp;break in the story</li>
<li>(9:30) The reporting lands just before the election and helps shift attention toward&nbsp;challenger Derwin Brown</li>
<li>(12:30) The corruption picture widens with allegations involving sexual harassment and&nbsp;sex-for-favors allegations, fake badges, and inmate labor</li>
<li>(15:00) Dale recalls the night police came to his door after Derwin Brown was murdered</li>
<li>(19:00) Dale learns he is also believed to be on the hit list, and he and his family are&nbsp;placed under protective custody</li>
<li>(23:30) An interview moment raises new questions about Sidney Dorsey&rsquo;s knowledge of&nbsp;the conspiracy</li>
<li>(27:15) A witness&rsquo;s note on a napkin helps lead investigators back to the murder plot</li>
<li>(28:30) Patrick Cuffy describes Dorsey giving the kill order on paper, then tearing it up&nbsp;and swallowing it</li>
<li>(33:30) Dale reflects on the cost of the case and his bond with the Brown family</li>
</ul>
&nbsp;
&nbsp;

The Derwin Brown Assassination: Dale Cardwell on Corruption, Retaliation, and Murder in DeKalb County

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/68cac57d-cb8d-4f96-8462-b400012dac23/transcript

This episode of Zone 7’s Crime Roundup captures the energy of the first stop on Sheryl McCollum’s 10-8 Tour: a packed house, a hot mic, and the kind of stories you only get when prosecutors, defense attorneys, detectives, and crime-scene folks are all sitting at the same table.

With Joshua Schiffer and Franz Borghardt alongside her, Sheryl recaps an unforgettable night featuring surprise moments, Trial Lawyers College stories, and Nancy Grace taking a rapid-fire stack of audience questions like only she can. Want to be in the room for the next event?

North Carolina is up next on February 28 at Kefi Vineyards & Winery. Grab your tickets here.

Highlights:

• (0:00) Welcome to Zone 7’s Crime Roundup with Sheryl McCollum, Joshua Schiffer, and Franz Borghardt

• (1:30) Dinner and stories at Manuel’s Tavern: packed full room full of energy

• (5:30) A Baton Rouge serial-killer case that kick-started Franz’s career

• (7:30) The “lean into what you’ve got” defense strategy when a club-shooting video is the evidence

• (9:15) Josh frames trial storytelling as emotional truth, clarity, and human stakes over technical brilliance

• (11:30) Trial Lawyers College in Wyoming and Gerry Spence as the foundation for storytelling that translates to true crime

• (19:30) The difference between networking and real respect, and why outcomes are better when lawyers and investigators talk

• (26:00) Sheryl on the CrimeCon glasses moment and the kind of crowd that looks out for you

• (28:30) Sheryl introduces Detective Jarion Shepherd and the Melissa Wolfenbarger connection

• (32:15) Nancy Grace walks in, takes the mic, and flips the room into live-show mode with nonstop Q&A

• (35:15) The 10-8 Tour roadmap, North Carolina on February 28, and the meaning of 10- 8

• (39:45) Sheryl lays down her friendship standard and closes with a true-friends quote



Guest Bio:

Joshua Schiffer is a Veteran trial attorney and one of Southeast's most respected legal voices. He is the founding partner at ChancoSchiffer P .C., where he has litigated high-stakes criminal, civil rights, and personal injury cases for over 2 decades. Schiffer is a frequent media contributor and an outspoken advocate for accountability.



Franz Borghardt is an attorney with more than a decade of experience. Franz has served as both a felony public defender and prosecutor in east Baton Rouge. He maintains a private practice spanning criminal defense, personal injury, family law, and small business matters.

Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire.



Sheryl “Mac” McCollum is an active crime scene investigator for a Metro Atlanta Police Department and the director of the Cold Case Investigative Research Institute, which partners with colleges and universities nationwide. With more than 4 decades of experience, she has worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing. Her work on high-profile cases, including The Boston Strangler, Natalie Holloway, Tupac Shakur and the Moore’s Ford Bridge lynching, led to her Emmy Award for CSI: Atlanta and induction into the National Law Enforcement Hall of Fame in 2023.



Social Links:

• Email: coldcase2004@gmail.com

• X: @ColdCaseTips

• Facebook: @sheryl.mccollum

• Instagram:@officialzone7podcast



Preorder Sheryl’s upcoming book, Swans Don’t Swim in a Sewer: Lessons in Life, Justice, and Joy from a Forensic Scientist, releasing May 2026 from Simon and Schuster.

https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-MacMcCollum/9798895652824

 

This episode of Zone 7&rsquo;s Crime Roundup captures the energy of the first stop on Sheryl&nbsp;McCollum&rsquo;s 10-8 Tour: a packed house, a hot mic, and the kind of stories you only get when&nbsp;prosecutors, defense attorneys, detectives, and crime-scene folks are all sitting at the same&nbsp;table.
With Joshua Schiffer and Franz Borghardt alongside her, Sheryl recaps an unforgettable&nbsp;night featuring surprise moments, Trial Lawyers College stories, and Nancy Grace taking a&nbsp;rapid-fire stack of audience questions like only she can. Want to be in the room for the next&nbsp;event?
North Carolina is up next on February 28 at Kefi Vineyards &amp; Winery. Grab your tickets here.
Highlights:
&bull; (0:00) Welcome to Zone 7&rsquo;s Crime Roundup with Sheryl McCollum, Joshua Schiffer, and&nbsp;Franz Borghardt
&bull; (1:30) Dinner and stories at Manuel&rsquo;s Tavern: packed full room full of energy
&bull; (5:30) A Baton Rouge serial-killer case that kick-started Franz&rsquo;s career
&bull; (7:30) The &ldquo;lean into what you&rsquo;ve got&rdquo; defense strategy when a club-shooting video is&nbsp;the evidence
&bull; (9:15) Josh frames trial storytelling as emotional truth, clarity, and human stakes over&nbsp;technical brilliance
&bull; (11:30) Trial Lawyers College in Wyoming and Gerry Spence as the foundation for&nbsp;storytelling that translates to true crime
&bull; (19:30) The difference between networking and real respect, and why outcomes are&nbsp;better when lawyers and investigators talk
&bull; (26:00) Sheryl on the CrimeCon glasses moment and the kind of crowd that looks out for&nbsp;you
&bull; (28:30) Sheryl introduces Detective Jarion Shepherd and the Melissa Wolfenbarger&nbsp;connection
&bull; (32:15) Nancy Grace walks in, takes the mic, and flips the room into live-show mode&nbsp;with nonstop Q&amp;A
&bull; (35:15) The 10-8 Tour roadmap, North Carolina on February 28, and the meaning of 10-&nbsp;8
&bull; (39:45) Sheryl lays down her friendship standard and closes with a true-friends quote 
Guest Bio:
Joshua Schiffer is a Veteran trial attorney and one of Southeast's most respected legal voices.&nbsp;He is the founding partner at ChancoSchiffer P .C., where he has litigated high-stakes criminal,&nbsp;civil rights, and personal injury cases for over 2 decades. Schiffer is a frequent media&nbsp;contributor and an outspoken advocate for accountability. 
Franz Borghardt is an attorney with more than a decade of experience. Franz has served as&nbsp;both a felony public defender and prosecutor in east Baton Rouge. He maintains a private&nbsp;practice spanning criminal defense, personal injury, family law, and small business matters.
Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire. 
Sheryl &ldquo;Mac&rdquo; McCollum is an active crime scene investigator for a Metro Atlanta Police&nbsp;Department and the director of the Cold Case Investigative Research Institute, which partners&nbsp;with colleges and universities nationwide. With more than 4 decades of experience, she has&nbsp;worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing.&nbsp;Her work on high-profile cases, including The Boston Strangler, Natalie Holloway, Tupac Shakur&nbsp;and the Moore&rsquo;s Ford Bridge lynching, led to her Emmy Award for CSI: Atlanta and induction&nbsp;into the National Law Enforcement Hall of Fame in 2023. 
Social Links:
&bull; Email: coldcase2004@gmail.com
&bull; X: @ColdCaseTips
&bull; Facebook: @sheryl.mccollum
&bull;&nbsp;Instagram: @officialzone7podcast 
Preorder Sheryl&rsquo;s upcoming book, Swans Don&rsquo;t Swim in a Sewer: Lessons in Life, Justice, and Joy from a Forensic Scientist, releasing May 2026 from Simon and Schuster.
<a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-MacMcCollum/9798895652824">https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-</a><a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-MacMcCollum/9798895652824">MacMcCollum/9798895652824</a>
&nbsp;

Crime Roundup: Inside the Zone 7 Live 10-8 Event at Manuel’s Tavern, and the 10-8 Tour Roadmap

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/c76c269a-65f9-4707-a517-b3fa0141418b/transcript

In this "Zone 7" special on the disappearance of 84-year-old Nancy Guthrie, Sheryl McCollum and retired NYPD detective Tom Smith break down what a disciplined first 24 hours should have looked like, and why the public-facing story has created confusion.

They walk through the biggest unanswered questions, including “unknown male DNA, ” the surveillance video, and why a classic ransom scenario is not tracking.

For those looking to catch up further as the situation develops, additional coverage and updates can be found on "Crime Stories with Nancy Grace."

Guest Bio:

Tom Smith is a retired NYPD detective and 2024 National Law Enforcement Hall of Fame inductee. With over 30 years of service, he worked in patrol, narcotics and robbery investigations and spent 17 years working with the FBI/NYPD on the Joint  terrorism task Force, including an overseas deployment to Afghanistan.

Tom co-hosts the podcast, "Gold Shields," and provides investigative commentary for national media outlets.

About the Host 

Sheryl “Mac” McCollum is an active crime scene investigator for a Metro Atlanta Police Department and the director of the Cold Case Investigative Research Institute, which partners with colleges and universities nationwide. With more than 4 decades of experience, she has worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing.

Her work on high-profile cases include The Boston Strangler, Natalie Holloway, and Tupac Shakur. Her work on the Moore’s Ford Bridge lynching led to her Emmy Award for "CSI: Atlanta" and induction into the National Law Enforcement Hall of Fame in 2023.

Social Links:

• Email: coldcase2004@gmail.com

• Twitter: @zone7squad

• Facebook: @sheryl.mccollum

• Instagram: @officialzone7podcast

Preorder Sheryl’s upcoming book, "Swans Don’t Swim in a Sewer: Lessons in Life,Justice, and Joy from a Forensic Scientist," releasing May 2026 from Simon and Schuster.

Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire.

Highlights:

• (0:00) Sheryl McCollum welcomes listeners, introduces the Nancy Guthrie case, and brings in Tom Smith for a Day One and Day Two reality check

• (1:45) First priority: secure the scene, set the perimeter, and control who comes and goes

• (3:15) Two-tape strategy, command center placement, and why media management is part of scene control

• (6:45) Why this case should trigger FBI resources quickly, including scale, reach, and operational support

• (11:15) Family liaison basics: keeping Savannah Guthrie informed without compromising the investigation

• (14:15) Could Savannah be the real target? Why some threats move through family

• (15:00) The man's on-camera behavior stands out: clothing, pacing, props, and missing urgency

• (16:15) “Ransom” is not tracking. The delays, the non-performance, and why this reads as personal

• (21:15) Blood pattern questions that should be treated as a major investigative signal

• (23:30) Unknown male DNA. What “unknown” means, why the recovery location matters, and what should have been clarified early

• (25:00) Geography, logistics, and why certain theories do not fit the known facts

• (27:15) The wagon wheel model. How video, leads, warrants, and tech teams feed one command structure

• (28:00) Crime scene control and the importance of limiting access

• (34:45) “There are things people need to know. If they don’t need to know it, don’t open your mouth.”

• (40:00) Optics blowback. The basketball game controversy and why public trust is an investigative asset.

• (46:30) Threat assessment red flags and what should have been screened

• (54:00) Two fixes that can sharpen the case now: a clean team review and stronger video enhancement



 

In this "Zone 7" special on the disappearance of 84-year-old Nancy Guthrie, Sheryl McCollum and retired NYPD detective Tom Smith break down what a disciplined first 24 hours should have looked like, and why the public-facing story has created confusion.
They walk through the biggest unanswered questions, including &ldquo;unknown male DNA, &rdquo; the surveillance video, and why a classic ransom scenario is not tracking.
For those looking to catch up further as the situation develops, additional coverage and updates can be found on "Crime Stories with Nancy Grace."
Guest Bio:
Tom Smith is a retired NYPD detective and 2024 National Law Enforcement Hall of Fame inductee. With over 30 years of service, he worked in patrol, narcotics and robbery investigations and spent 17 years working with the FBI/NYPD on the Joint&nbsp; terrorism task Force, including an overseas deployment to Afghanistan.
Tom co-hosts the podcast, "Gold Shields," and provides investigative commentary for national media outlets.
About the Host&nbsp;
Sheryl &ldquo;Mac&rdquo; McCollum is an active crime scene investigator for a Metro Atlanta Police&nbsp;Department and the director of the Cold Case Investigative Research Institute, which partners&nbsp;with colleges and universities nationwide. With more than 4 decades of experience, she has&nbsp;worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing.
Her work on high-profile cases include The Boston Strangler, Natalie Holloway, and Tupac Shakur. Her work on the Moore&rsquo;s Ford Bridge lynching led to her Emmy Award for "CSI: Atlanta" and induction into the National Law Enforcement Hall of Fame in 2023.
Social Links:
&bull; Email: coldcase2004@gmail.com
&bull; Twitter: @zone7squad
&bull; Facebook: @sheryl.mccollum
&bull; Instagram: @officialzone7podcast
Preorder Sheryl&rsquo;s <a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-MacMcCollum/9798895652824">upcoming book</a>, "Swans Don&rsquo;t Swim in a Sewer: Lessons in Life,Justice, and Joy from a Forensic Scientist," releasing May 2026 from Simon and Schuster.
Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps others find the show and supports the mission to educate, engage, and inspire.
Highlights:
&bull; (0:00) Sheryl McCollum welcomes listeners, introduces the Nancy Guthrie case, and&nbsp;brings in Tom Smith for a Day One and Day Two reality check
&bull; (1:45) First priority: secure the scene, set the perimeter, and control who comes and&nbsp;goes
&bull; (3:15) Two-tape strategy, command center placement, and why media management is&nbsp;part of scene control
&bull; (6:45) Why this case should trigger FBI resources quickly, including scale, reach, and&nbsp;operational support
&bull; (11:15) Family liaison basics: keeping Savannah Guthrie informed without compromising&nbsp;the investigation
&bull; (14:15) Could Savannah be the real target? Why some threats move through family
&bull; (15:00) The man's on-camera behavior stands out: clothing, pacing, props, and missing&nbsp;urgency
&bull; (16:15) &ldquo;Ransom&rdquo; is not tracking. The delays, the non-performance, and why this reads&nbsp;as personal
&bull; (21:15) Blood pattern questions that should be treated as a major investigative signal
&bull; (23:30) Unknown male DNA. What &ldquo;unknown&rdquo; means, why the recovery location&nbsp;matters, and what should have been clarified early
&bull; (25:00) Geography, logistics, and why certain theories do not fit the known facts
&bull; (27:15) The wagon wheel model. How video, leads, warrants, and tech teams feed one&nbsp;command structure
&bull; (28:00) Crime scene control and the importance of limiting access
&bull; (34:45) &ldquo;There are things people need to know. If they don&rsquo;t need to know it, don&rsquo;t open&nbsp;your mouth.&rdquo;
&bull; (40:00) Optics blowback. The basketball game controversy and why public trust is an&nbsp;investigative asset.
&bull; (46:30) Threat assessment red flags and what should have been screened
&bull; (54:00) Two fixes that can sharpen the case now: a clean team review and stronger&nbsp;video enhancement 
&nbsp;

Nancy Guthrie Disappearance: Blood Evidence, Surveillance Video, and Why a Ransom Claim is Not Tracking

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/7e06f308-89e6-4bbd-87e8-b3fa01393f01/transcript

Introducing: Zone 7 with Sheryl McCollum

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