Forensic Files - Season 4, Ep 1: Invisible Intruder
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In 1996, police received a call from Darlie Routier telling them of her two sons' murders. However, investigators were not certain about the validity of Darlie's story and began an intensive search of the crime scene. The police found out who the killer was by analyzing blood spatter, doing behavioral profiling and analyzing Darlie's 911 call. Originally aired as Season 4, Episode 1.