John's behavior shifted after taking a consulting job far from home, spending more time away and not coming home on weekends, which made Casey's friends wonder if he was seeing another woman.
Casey found a hotel charge on her credit card while John was supposed to be away on a weekend trip with the guys, leading her to suspect infidelity. She drove to the hotel and demanded the room number, but no one answered her banging on the door.
Casey's friends described her as glowing and happy when discussing her reconciliation with John, indicating that she was optimistic about working on their marriage.
The condo was ransacked, but nothing of value was taken, and there was no forced entry, suggesting the crime scene was staged to look like a burglary.
John was candid about the status of his marriage with Casey, mentioning they were separated but trying to get back together. This, combined with his eagerness to help find her killer, made him a primary suspect.
John revealed that his previous wife, Carol, had been murdered in 1996, a fact he had not mentioned during their initial interviews, which was a significant omission.
John drove by the funeral home multiple times before entering, and his behavior was noted as overly emotional and suspicious, leading to increased scrutiny.
Lisa described how John started demanding to know who she was with and tracking her mileage to confirm where she had been, suggesting a pattern of increasing control and manipulation.
They recorded a conversation with John while wired for sound, hoping to catch him in inconsistencies or admissions about his relationship with Casey and her murder.
John Peak pleaded guilty to the murders of both Casey and Carol, avoiding a trial and receiving a life sentence without the possibility of parole.
A woman's murder shines a light on an unsolved mystery from years earlier. As the connection between the two cases becomes clear, a long-hidden truth surfaces. Could a master manipulator be behind both crimes? Andrea Canning reports.