Ep 1. The Yosemite Park Murders

In the season 4 premiere of Forensic Factor titled "The Yosemite Park Murders," investigators dive into the brutal murders of three tourists who were visiting Yosemite National Park. Carole Sund, her teenage daughter Juli, and Juli's friend Silvina Pelosso were all found dead in their rental car in February 1999.

The episode begins by detailing the events leading up to the discovery of the bodies and the subsequent investigation. It's revealed that the three women had been missing for several days before their bodies were found, making it difficult for authorities to determine the cause of death. DNA evidence was collected from the crime scene, which would prove crucial in identifying the killer.

As the investigation unfolds, a suspect emerges in the form of Cary Stayner, a handyman who worked at a nearby lodge. Stayner, who had a history of mental illness, was initially considered a person of interest due to his proximity to the crime scene. However, it wasn't until he committed another murder weeks later that he became the prime suspect in the Yosemite Park Murders.

Investigators explore Stayner's troubled past and delve into his motives for committing such heinous crimes. They also analyze his behavior leading up to his eventual arrest, comparing it to other serial killers in order to better understand his psychology.

Through interviews with law enforcement officials, forensic experts, and family members of the victims, this episode provides an in-depth look into the investigation and subsequent trial. Viewers will witness how advanced forensic technology, including DNA analysis and blood spatter analysis, was used to link Stayner to the crimes and ultimately secure his conviction.

Overall, "The Yosemite Park Murders" is a captivating episode that highlights the importance of forensic evidence in solving even the most complicated of cases. By presenting viewers with a detailed account of the investigation, the episode sheds light on the tireless work of law enforcement officials and forensic specialists in bringing killers to justice.