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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

After weeks of testimony and a defense case that ended without a single witness, the jury in the Kouri Richins trial returned a guilty verdict in the death of Eric Richins. In this week’s episode of Zone 7 Sheryl McCollum talks with investigative reporter Nate Eaton, who has been in court following the testimony, key witnesses, and the evidence surrounding Eric's death. Together, they discuss the prosecution's theory of motive, the evidence tied to money and deception, the Valentine's Day attempted-poisoning allegation, and the courtroom testimony that steadily tightened the case. Sheryl then adds a final trial update after the verdict, focusing on what the defense did not answer and what the guilty verdict says about the case.



Highlights:

(0:00) Sheryl McCollum welcomes Nate Eaton for a courtroom-level look at the Kouri Richins trial

(2:30) Why Robert Josh Grossman’s testimony stood out as one of the strangest and most revealing moments in court

(4:00) Eric Richins’ death, the 911 call, and autopsy findings pointing toward fentanyl poisoning

(5:00) Life insurance questions, trust issues, and millions in debt

(7:15) The children’s grief book and why it still leaves people feeling unsettled

(9:15) How testimony from the alleged dealer and the house cleaner helped prosecutors build their fentanyl theory

(10:45) The Valentine's Day sandwich allegation and why prosecutors pointed to it as an earlier attempted poisoning

(13:45) Internet searches about fentanyl, prison, and life insurance payouts add to the prosecution’s theory on intent

(15:00) A forged $250,000 HELOC, hidden financial decisions, and contact with a divorce attorney show a marriage in decline

(21:00) The scope of Kouri’s financial collapse and apparent lack of remorse

(27:45) Money-themed memes found on Kouri’s phone just hours after Eric's death

(30:45) Final update: Sheryl reacts to the finals days of the trial and the guilty verdict



Guest Bio:

Nate Eaton is an award-winning journalist, Dateline NBC contributor, and co-founder of EastIdahoNews.com. He is known for his investigative reporting, courtroom coverage, and years of experience covering major criminal cases and breaking news.



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

Twitter: @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-Mac-McCollum/9798895652824

 

After weeks of testimony and a defense case that ended without a single witness, the jury in the&nbsp;Kouri Richins trial returned a guilty verdict in the death of Eric Richins. In this week&rsquo;s episode of Zone 7 Sheryl McCollum talks with investigative reporter Nate Eaton, who has been in court&nbsp;following the testimony, key witnesses, and the evidence surrounding Eric's death. Together,&nbsp;they discuss the prosecution's theory of motive, the evidence tied to money and deception, the&nbsp;Valentine's Day attempted-poisoning allegation, and the courtroom testimony that steadily&nbsp;tightened the case. Sheryl then adds a final trial update after the verdict, focusing on what the&nbsp;defense did not answer and what the guilty verdict says about the case. 
Highlights:
(0:00) Sheryl McCollum welcomes Nate Eaton for a courtroom-level look at the Kouri&nbsp;Richins trial
(2:30) Why Robert Josh Grossman&rsquo;s testimony stood out as one of the strangest and&nbsp;most revealing moments in court
(4:00) Eric Richins&rsquo; death, the 911 call, and autopsy findings pointing toward fentanyl&nbsp;poisoning
(5:00) Life insurance questions, trust issues, and millions in debt
(7:15) The children&rsquo;s grief book and why it still leaves people feeling unsettled
(9:15) How testimony from the alleged dealer and the house cleaner helped prosecutors&nbsp;build their fentanyl theory
(10:45) The Valentine's Day sandwich allegation and why prosecutors pointed to it as an&nbsp;earlier attempted poisoning
(13:45) Internet searches about fentanyl, prison, and life insurance payouts add to the&nbsp;prosecution&rsquo;s theory on intent
(15:00) A forged $250,000 HELOC, hidden financial decisions, and contact with a&nbsp;divorce attorney show a marriage in decline
(21:00) The scope of Kouri&rsquo;s financial collapse and apparent lack of remorse
(27:45) Money-themed memes found on Kouri&rsquo;s phone just hours after Eric's death
(30:45) Final update: Sheryl reacts to the finals days of the trial and the guilty verdict 
Guest Bio:
Nate Eaton is an award-winning journalist, Dateline NBC contributor, and co-founder of&nbsp;EastIdahoNews.com. He is known for his investigative reporting, courtroom coverage, and years&nbsp;of experience covering major criminal cases and breaking news. 
Enjoying Zone 7? Leave a rating and review where you listen to podcasts. Your feedback helps&nbsp;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&nbsp;integrates evidence, media, and advanced forensic testing. 
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:
Email: coldcase2004@gmail.com
Twitter: @ColdCaseTips
Facebook: @sheryl.mccollum●
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-Mac-McCollum/9798895652824">https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-Mac-Mc</a><a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-Mac-McCollum/9798895652824">Collum/9798895652824</a>
&nbsp;

Inside the Case Against Kouri Richins: Nate Eaton on the Evidence Behind the Guilty Verdict

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/257533a2-7958-469a-8f60-b41000d91718/transcript

When an 84-year-old woman vanishes from her home in the middle of the night, leaving behind signs of blood and a struggle, every early decision investigators make is critical.

Retired NYPD sergeant Joe Giacalone returns to Zone 7 to talk with Sheryl McCollum about the Nancy Guthrie investigation and the mistakes they believe set the case back from the start.

Together, they walk through the investigative failures, why the ransom note narrative never rang true, and the steps investigators can still take to regain traction.

Guest Bio

Joe Giacalone is a retired NYPD sergeant and former commanding officer of the Bronx Cold Case Squad. He serves as an adjunct professor at John Jay College of Criminal Justice and is the author of, "The Criminal Investigative Function: A Guide for New Investigators and The Cold Case Handbook."

Giacalone also hosts True Crime with the Sarge and is a frequent media commentator on criminal investigations.

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 case include, in part, The Boston Strangler, Natalie Holloway, and Tupac Shakur. McCollum's 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 Joe Giacalone and frames the Nancy Guthrie investigation as a real-time lesson in investigative breakdowns

(3:30) Why Nancy Guthrie’s case should have been treated as a homicide or kidnapping from day one

(4:15) Why full scene lock down, a command post, and a strict crime scene log should have been prioritized immediately

(5:30) Why uncontrolled foot traffic, outside workers, and a scattered “egg hunt” search approach can create long-term problems for investigators and future prosecution

(7:15) Nancy’s age, health, and the blood evidence on scene make a voluntary disappearance difficult to believe

(9:45) Joe and Sheryl discuss the decision to release the house and why they believe that hurt the case

(12:15) Media management failures, public optics, and the confusion created by inconsistent messaging

(17:00) Proactive steps that could still generate leads and how holding Annie Guthrie’s car fueled unnecessary suspicion

(20:15) The dangers of publicly naming persons of interest too early in an active investigation

(24:00) Morale, leadership, and why command staff should be supplying resources and backing investigators

(38:00) Final message to officials in charge: put aside conflict, align with the FBI, and get the investigation back on track



 

When an 84-year-old woman vanishes from her home in the middle of the night, leaving behind&nbsp;signs of blood and a struggle, every early decision investigators make is critical.
Retired NYPD&nbsp;sergeant Joe Giacalone returns to Zone 7 to talk with Sheryl McCollum about the Nancy Guthrie&nbsp;investigation and the mistakes they believe set the case back from the start.
Together, they walk through the investigative failures, why the ransom note narrative never rang true, and the steps investigators can still take to regain traction.
Guest Bio
Joe Giacalone is a retired NYPD sergeant and former commanding officer of the Bronx Cold Case Squad. He serves as an adjunct professor at John Jay College of Criminal Justice and is the author of, "The Criminal Investigative Function: A Guide for New Investigators and The Cold Case Handbook."
Giacalone also hosts True Crime with the Sarge and is a frequent media commentator on criminal investigations.
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&nbsp;integrates evidence, media, and advanced forensic testing.
Her work on high-profile case include, in part, The Boston Strangler, Natalie Holloway, and Tupac Shakur. McCollum's work on 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:
Email: coldcase2004@gmail.com
X: @zone7squad
Facebook: @sheryl.mccollum
Instagram: @officialzone7podcast
Preorder Sheryl&rsquo;s <a href="https://www.simonandschuster.com/books/Swans-Dont-Swim-in-a-Sewer/Sheryl-Mac-McCollum/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:
(0:00) Sheryl McCollum introduces Joe Giacalone and frames the Nancy Guthrie&nbsp;investigation as a real-time lesson in investigative breakdowns
(3:30) Why Nancy Guthrie&rsquo;s case should have been treated as a homicide or kidnapping&nbsp;from day one
(4:15) Why full scene lock down, a command post, and a strict crime scene log should&nbsp;have been prioritized immediately
(5:30) Why uncontrolled foot traffic, outside workers, and a scattered &ldquo;egg hunt&rdquo; search&nbsp;approach can create long-term problems for investigators and future prosecution
(7:15) Nancy&rsquo;s age, health, and the blood evidence on scene make a voluntary&nbsp;disappearance difficult to believe
(9:45) Joe and Sheryl discuss the decision to release the house and why they believe&nbsp;that hurt the case
(12:15) Media management failures, public optics, and the confusion created by&nbsp;inconsistent messaging
(17:00) Proactive steps that could still generate leads and how holding Annie Guthrie&rsquo;s&nbsp;car fueled unnecessary suspicion
(20:15) The dangers of publicly naming persons of interest too early in an active&nbsp;investigation
(24:00) Morale, leadership, and why command staff should be supplying resources and&nbsp;backing investigators
(38:00) Final message to officials in charge: put aside conflict, align with the FBI, and get&nbsp;the investigation back on track 
&nbsp;

The Nancy Guthrie Investigation: Joe Giacalone on Early Errors and What Should Happen Next

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/d19a8f46-0c52-4990-8425-b40801221b0e/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

Introducing: Zone 7 with Sheryl McCollum

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