Grave Mysteries

High school freshman Shaniesha Forbes' body is found on a beach in Brooklyn, N.Y.; NYPD detectives discover her social media life includes a list of 1,600 Facebook friends and possible suspects.

Thirty-two-year-old Becky Brosnan goes missing; while a Myspace message says she's left to find herself, everyone says Becky would never abandon her children; now, detectives must piece together Becky's life to uncover what really happened to her.

Tiffanie Adams' body is found in a field; a small-town sheriff must retrace the expectant mother's steps to catch her killer; Tiffanie's online life points the way to a dark secret and a ruthless murderer.

In Colorado Springs, Colo., 27-year-old single mother Ashley Melnyczok is murdered in her home; while hunting for clues, police hunt down a cast of dangerous characters and uncover a heinous plot.

In 2007, parents return home to find blood everywhere and their daughter missing. When police find her body, they use her social media pages to catch the killer.

An interior designer loves meeting people on the internet. When he's found dead, police believe one of the online strangers might be the person who killed him.