Back country ranger Randy Morgenson was the go to person if someone was lost or missing in Sequoia Kings Canyon National Park, until the day he vanishes. Colleagues search for him in dangerous terrain uncovering unsettling secrets. What happened ...

17-yr-old Chris Daigle vanishes shortly after leaving Hightower High School for the day in Missouri City, TX. Family members and law officials spend years dissecting the weeks and months leading up to the day the baseball all star disappears.

Tiffany Sayre, a 26-year-old mother of two, was last seen alive around midnight on May 11, 2015. Her body was found on June 20, 2015, in a culvert along a rural highway. Her manner of death is Homicidal Violence and her case remains open.

May 29, 2015: Eighteen days after Tiffany Sayre's disappearance.

While searching for the fifth missing woman, another body is found. With the help of an anonymous tip, police are onto a possible suspect within hours. The community digs in once again on the possibility of a serial killer.

After discovering one of the missing women was friends with one of the women found dead, police redouble their efforts to find the missing woman. A person of interest is considered when the news of another missing girl sends Chillicothe into a panic.

When Diana spoke to her daughter Wanda Lemons on October 2, 2014, everything seemed to be on track. But then Wanda went silent. At first, a tip that she caught a ride to Texas gives law enforcement hope that she might be alive. But further investigation into her case soon makes investigators think otherwise.

Whenever he's home on leave, devoted father and military helicopter pilot Bob Yates loves videotaping his wife Linda and their four children. But when they move to Spokane, WA - those videos take a sinister turn.

In rural Ohio, an intruder brutally guns down Jack and Linda Myers in their sleep. The only witness is their sleepy four-year-old grandson. Now, members of the Myers family are speaking out about the horror of what happened that night.

When a mysterious illness strikes down Frank Hilley - the father of a prosperous family living in Anniston, Alabama - his widow Marie is forced to raise their two children alone. But then - the family starts receiving strange threats.

Secret double lives of the killers among us exposed.

Learn more about Alice Crimmins and the time period in which she lived.

Key Biscayne, FL, 1964: 40-year-old Candy Mossler finds her multi-millionaire husband, 69-year-old Jacques stabbed to death in their apartment. Detectives are swept into a twisted tale of incest, secret homosexual liaisons, and money, money, money...

1968: When a local reporter receives a mysterious phone call from a murderer who threatens to kill again, Gaffney police must race against the clock to try to save the town's teen girls.

Key Biscayne, FL, 1964: Candy Mossler finds her multi-millionaire husband, Jacques, stabbed to death in their apartment. Detectives are swept into a twisted tale of incest, secret homosexual liaisons, and money, money, money...

The story behind Truman Capote's classic In Cold Blood when the four members of the Clutter family are brutally murdered, detectives mount a nationwide search for the killers and face the chilling prospect that they died for no reason whatsoever.