People Magazine Investigates

When a vivacious young escort, Shannan Gilbert, vanishes on Long Island's south shore in 2010, her disappearance leads police to discover the bodies of ten other victims dumped by a serial killer.

The discovery of four women's bodies on Gilgo Beach was just the beginning. But who is the Long Island Serial Killer? Investigators uncover multiple suspects and shocking theories, as they race to capture this prolific killer before he strikes again.

[Gone Without a Trace] In 2011, a 10-month-old baby girl goes missing from her home in Kansas City. The family fears she's been kidnapped by a drifter, only to be accused by the police of being responsible for her disappearance.

[Murder by the Book] On June 12, 1991, outgoing Jackie Galloway is found strangled and bound with ritualistic knots. Police investigate suspects in her inner circle but are shocked when a chance encounter with a prowler leads them to discover the murderer is a budding serial killer.

[The Keddie Murders] A mother and three teens are murdered in the remote town of Keddie, California. Despite a trail of suspects and illicit activity, no one was ever brought to justice. But recently discovered evidence may be the key to finally cracking case.

[A Ghastly Discovery] In 2012, hikers in Los Angeles' Hollywood Hills discover the severed head of Hervey Medellin, a retired flight clerk. The cast of suspects includes former lovers, drug cartels and a murderous porn star, in a tale of lust, greed and butchery.