48 Hours

Investigators suspected that oil on the road had come from the vehicle that struck McClendon. Following the oil trail, the sheriff's deputies were led to the home where Ackerman lived. Ackerman had spent the day with his three children, but investigators quickly noticed red flags, including his Ford pickup, which was leaking oil in the driveway. Its front grille was broken, and a palm print was visible on the hood.

The body of 22-year-old Cati Blauvelt was discovered in an abandoned farmhouse in Simpsonville, S.C., on Oct. 26, 2016. Almost immediately, her friends had one suspect in mind, John Blauvelt, Cati Blauvelt's estranged husband and a once-respected army recruiter. Their brief marriage had ended in turmoil, with Cati Blauvelt filing a domestic violence report against him. As police investigated, another name entered the picture, 17-year-old Hannah Thompson, who had moved in with John Blauvelt as his marriage unraveled. With no hard evidence to hold him, authorities were powerless to stop what happened next. Declared armed and dangerous, John Blauvelt vanished into the night, taking Thompson with him … and then the manhunt began.

When Angela Prichard was terrorized by her husband, she turned to the police for help. Prichard called repeatedly as he stalked, harassed and threatened her. But none of this stopped him from murdering her. 

A Los Angeles man, David Pearce, is awaiting sentencing after he was found guilty last month of murdering two young women and sexually assaulting seven others. 48 HOURS and correspondent Jonathan Vigliotti have been investigating this case for more than three years. He speaks exclusively with one survivor who is now bravely sharing her story.