"This case involves the 9-year-old girl who was murdered by her 15-year-old neighbor, Alyssa Bustamante, in October 2009. Bustamante's chilling motive was to experience killing someone, and she documented it in her diary. The episode will explore the investigation that led to her arrest and conviction."

"A young couple vanishes days after telling friends about a disturbing man at their campsite."

"A decorated Marine is ambushed and killed at her kids' school, triggering a frantic police pursuit."

"When a woman's husband and lover are found dead, police uncover a deadly marriage pact."

"Police investigating a brutal double-homicide learn the prime suspect appears to be a grandmother."

"When a religious woman goes missing, her Christian family begins to question her husband's devotion."

"When four hikers go missing in the Appalachian Mountains, investigators suspect a serial killer is lurking in the forest; Time is running out for them to catch him before he selects another victim."

"When the remains of seven people are found behind a strip mall, detectives suspect they are looking for one of Connecticut's most prolific serial killers; a conversation over a game of cards in prison blows the case wide open."

"Firefighter William Walker is shot outside his home in what appears to be a robbery gone wrong; when detectives dig deeper, an anonymous call leads them to a chilling truth."

"For years, young men have been vanishing in Louisiana, their bodies later found dumped in waterways; with no suspect and no leads, the case goes cold until one man escapes, setting off a dramatic police sting."