David Begnaud

How police connected the murders of two young women to a man known as a zombie-fighting comic book hero. "48 Hours" correspondent Peter Van Sant reports.

A nurse is shot dead in her apartment; investigators note unusual findings, raising doubt about whether it was a self-inflicted act or something more sinister.

The case of 17-year-old Benjamin Elliott, whose defense team says he was sleepwalking when he fatally stabbed his twin sister.

A mother of six becomes deathly ill with unusual symptoms. Investigators suspect she was murdered with a poison protein shake."48 Hours" contributor Natalie Morales reports.

Investigators are locked in a 30-year game of cat and mouse with a child serial killer to find the body of 12-year-old Sara. "48 Hours" correspondent Erin Moriarty reports.

A crime scene investigator is gunned down in broad daylight. The harrowing scene is captured on surveillance video. Who pulled the trigger? "48 Hours" correspondent Erin Moriarty reports.