A young woman's frozen body was found in a suitcase in Connecticut, six days after 24-year-old Valerie Reyes vanished from her home in New Rochelle, New York.

Season 6 Episode 6 Exclusive: Investigators work to figure out what happened to John Madsen.

Season 6 Episode 6 Exclusive: A suspect in the disappearance of John Madsen opens up to police about his plans to use stolen credit cards to build a remote marijuana farm.

Season 6 Preview: Police find the body of a young woman in a suitcase, but who could have killed her?

When a successful Phoenix realtor disappears in the desert, investigators discover that a killer is targeting real estate agents and must catch him before he strikes again.

Three additional teens have come forward to accuse Liberty Christian Academy principal Jason Kennedy of sexual misconduct following his arrest for sex crimes against a former student.

Learn more about what happened to Elizabeth Sullivan, who mysteriously vanished and then was found dead two years later in San Diego Bay in California.

Learn more about what happened to Kristin Smart, 19, who vanished after an off-campus party, and about the man eventually convicted in the case.

Season 6 Preview: One of Valerie Reyes' friends speaks to police about her friend's activity and dating life before her death.