F2: Forensic Factor

The probe of a rich Texas playboy's murder has investigators examining X-rated photos, shocking videos and an object hidden in the victim's body.

A serial killer stalks Phoenix under cover of night with a virtually untraceable gun.

The police probe the murders of two elderly women and uncover an appalling ritual.

A serial shooter menaces East Point, Ga., and leaves messages behind signed "Jack."

Investigators use forensic dentistry and acoustic technology to track a man who killed one girl and clubbed another in Abbotsford, B.C.

A teenage girl is stabbed to death, and investigators link her to a shocking love triangle.