It takes only three minutes for a lifeguard's future to be forever changed.

For Crystal, Hurricane Harvey wasn't the worst tragedy of August 2017.

A woman's joyous solo vacation ends with a deadly betrayal.

Police try to solve the disappearance of two friends and one of their moms.

A family fears for entrepreneur Chris Smith when his emails suddenly stop.

Police look for 10-year-old Kevin Collins, who disappeared on his way home.

From 1971 to 1972, a killer abducts and murders girls in Washington, DC.

Police untangle a web of politics and gangs behind Dr. Haing Ngor's murder.

Investigators look for NBA star Lorenzen Wright's killer for seven years.

In 2004, murder grips the family of a federal judge, initiating a manhunt.

Debi Whitlock is killed in 1988 and a surprise witness tips off the police.

James Pierson is murdered and police turn their focus on his daughter.

Rob Andrew is murdered and detectives uncover lies leading to the killers.

In 2018, Cheryl Coker disappears and authorities uncover a web of secrets.

In June 1971, Greg Harris is murdered in the streets of Detroit.

Two middle school girls are murdered in the woods by a mysterious stranger.