When a co-worker finds 67-year-old Karen Navarra dead in a bloody scene at her San Jose, California, home, the physical evidence baffles police, until they discover data from Navarra's FitBit watch to solve the brutal crime.

A detective enters the digital world to catch a vicious child killer.

Detectives follow a digital trail to uncover what happened to a young mom.

When two girls go missing, their devices hold vital clues for detectives.

Digital forensics lead investigators to 3-year-old Brendan Creato's killer.

Detectives uncover the truth behind a missing woman's digital trail.