1. Becky Bliefnick and Keeley Bunker

While investigators uncover a twist in one murder case, digital evidence raises questions in another.

2. Jasmine Pace and Megan Newton

CCTV and GPS find the killer of Jasmine Pace; digital forensics reveals Megan Newton's killer.

4. Collin Turner and Mary Kay Wohlfarth

A 9-1-1 call captures the final moments of Collin Turner; CCTV helps reveal Mary Kay Wohlfarth's killer.

5. Idaho Students and Louis Price

Surveillance footage plays a central role in tracking down the killers in two murder cases.

6. Colby Vinson and Laura Johnson

Footprints unravel lies in one case; CCTV retraces the final moments of a victim.

7. Lauren DeWise and Cristina Ortiz-Lozano

Footprints unravel lies in one case; CCTV retraces the final moments of a victim.

8. Dylan Rounds and Cristina Prodan

A killer records himself tampering with the weapon; phone data exposes betrayal.

9. Kristil Krug and Natasha Morais

Two separate cases reveal how betrayal leads to tragic consequences.

10. Josh Bashford, Chloe Bashford and Shannon Hiott

A double murder case ends in a confession; CCTV exposes a jealous former partner.