Christopher Gregor, now on trial, is charged in the death of his 6-year-old son Corey Micciolo.

Gregor took his son to the hospital saying he put his son down for a nap because he was sleepy and nauseous. When Corey woke up he was stumbling, slurring his words, and having trouble breathing. Corey died at the hospital.

Surveillance video inside the gym facility at the complex where Gregor lived shows Corey running on a treadmill while Gregor turns up the speed and incline of the machine until the 6-year-old can’t keep up and falls off. Gregor lifts the boy off the ground by his shirt, holding Corey over the running treadmill.

Corey’s feet slide out from under him several times as he tries to get his footing, and Gregor appears to bite Corey on the back of the head. Corey eventually starts running again and falls from the treadmill five more times before Gregor shuts it off and they leave together.

Corey’s mother, Breanna Micciolo testified that she feared for Corey’s life. Documentation shows she made more than 100 calls and emails to the Department of Child Protection reporting abuse. Pediatrician Dr. Nancy Deacon who treated Corey days before his death, testified to what she observed.

Deacon listed a blue-grey bruise on his left cheek, a large yellow-green bruise on his left shoulder, another large yellow-green bruise on his left inner arm, and a blue bruise present on his elbow. Beyond over 12 bruises that covered Corey Micciolo's body, the doctor noted two areas on the right side of his chest, she called it two areas of hyper-pigmented skin, meaning the wound was healing but pigment had not yet returned.

JOINING NANCY TODAY: 

• Jarrett Ferentino – Homicide Prosecutor; Facebook & Instagram: Jarrett Ferentino 
• Dr. Bethany Marshall – Psychoanalyst (Beverly Hills); X: @DrBethanyLive/ Instagram & TikTok: drbethanymarshall; Appearing in “Paris in Love” on Peacock
• Bill Daly – Former FBI Investigator and Forensic Photography, Security Expert
• Dr. Kendall Crowns – Chief Medical Examiner Tarrant County (Ft Worth) and Lecturer: University of Texas Austin and Texas Christian University Medical School
• Nicole Partin - Crimeonline.com Investigative Reporter