Love Bites F2: Forensic Factor : Season 7 Episode 6

A vivacious teenage girl is found brutally stabbed to death in her car in a small Pennsylvania city. The motive is elusive; she wasn't sexually assaulted, and she was happy and popular. But as police look closer, they discover she was involved in a shocking love triangle that breaks all the rules. The suspects' stories overlap and raise more questions than they answer.