On the search for Shannan Gilbert, the bodies of four women, all in their 20s and presumed to be sex workers, were found over three days. They were all fully intact skeletons discovered in burlap.

Enter Oak Beach: a desolate community considered a party town in the 1970s.

On the night of her disappearance, Shannan Gilbert frantically called 911 saying, "They’re Trying to Kill Me!"

In 2010, a vivacious young escort, Shannan Gilbert, visits a client on the south shore of Long Island and vanishes under mysterious circumstances. Her disappearance leads police to the bodies of other victims buried along the shore. This discovery unleashes a wave of secrets, suspects, recriminations and conspiracy theories in the hunt for a serial killer who targets prostitutes.

Since 2010, 17 bodies have been discovered in and around New York's Gilgo Beach. The bodies found were of female escorts who solicited their services on Craigslist. Could a group of people be responsible?

Since 2010, 17 bodies have been discovered in and around New York's Gilgo Beach. Authorities believe this could be the work of the Long Island Serial Killer.

The Long Island Serial Killer is believed to have murdered Shannan Gilbert- but the Gilbert family has suffered another shocking tragedy. Shannan’s mother Mari was murdered on July 23, 2016, two months after her interview with Investigation Discovery’s People Magazine Investigates.

In 2011, Kansas City: Electrician Jeremy Irwin returns home after a late-night shift and his 10-month-old daughter Lisa is missing. He wakes up his fiancée Debbie Bradley and their two young sons and the family frantically searches for Lisa. She is nowhere to be found. Police initially focus their investigation on neighbors and drifters, but in a stunning turnaround, accuse the family of being responsible. As the case gains national attention and the two sides battle it out in the media, reputations are ruined, relationships are broken and the fate of a small child is left hanging in the balance.

Sarasota, Florida: 1991. Outgoing Jackie Galloway is found strangled and bound with ritualistic knots. Police investigate a number of likely 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.

On the search for Shannan Gilbert, the bodies of four women, all in their 20s and presumed to be sex workers, were found over three days. They were all fully intact skeletons discovered in burlap.

Enter Oak Beach: a desolate community considered a party town in the 1970s.

Since 2010, 17 bodies have been discovered in and around New York's Gilgo Beach. Authorities believe this could be the work of the Long Island Serial Killer.

On the night of her disappearance, Shannan Gilbert frantically called 911 saying, "They’re Trying to Kill Me!"

The Long Island Serial Killer is believed to have murdered Shannan Gilbert- but the Gilbert family has suffered another shocking tragedy. Shannan’s mother Mari was murdered on July 23, 2016, two months after her interview with Investigation Discovery’s People Magazine Investigates.

In 2010, a vivacious young escort, Shannan Gilbert, visits a client on the south shore of Long Island and vanishes under mysterious circumstances. Her disappearance leads police to the bodies of other victims buried along the shore. This discovery unleashes a wave of secrets, suspects, recriminations and conspiracy theories in the hunt for a serial killer who targets prostitutes.

In 2011, Kansas City: Electrician Jeremy Irwin returns home after a late-night shift and his 10-month-old daughter Lisa is missing. He wakes up his fiancée Debbie Bradley and their two young sons and the family frantically searches for Lisa. She is nowhere to be found. Police initially focus their investigation on neighbors and drifters, but in a stunning turnaround, accuse the family of being responsible. As the case gains national attention and the two sides battle it out in the media, reputations are ruined, relationships are broken and the fate of a small child is left hanging in the balance.

Sarasota, Florida: 1991. Outgoing Jackie Galloway is found strangled and bound with ritualistic knots. Police investigate a number of likely 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.

A young couple, The Stuarts, are robbed and shot in Boston. Carol and her unborn child are killed. Charles survives to describe their black assailant, inflaming racial tensions, until a surprise witness comes forward with a story that blows open the case.

After he clashes with co-workers, Tom Monfils mysteriously disappears on the job at a Green Bay paper mill. Soon enough it looks like murder, but no one is talking to detectives. Is it a conspiracy of silence, or a tragic miscarriage of justice?

When Long Island newlywed Lisa Solomon disappears on Christmas Eve, family and friends search for her relentlessly. Did she leave her husband of two months in the middle of the night? Or is there something more sinister at play?

Beautiful teenager Jennifer Levin is found strangled to death in Central Park. A prep school heartthrob, Robert Chambers, is arrested for the crime. The press seizes on his provocative claim that Jennifer’s death happened accidently during “rough sex.”

A new potential eyewitness comes forward to the team with a shocking revelation that could blow the investigation wide open.

The team of investigators sits down with Fred Goldman, Ron Goldman’s father, and Tanya Brown, Nicole Brown Simpson’s sister, to learn their thoughts on new investigations and suspects.

Many killers have a playground and the I-5 interstate that runs along the West Coast is where this killer likes to play.

Cindy Schaefer was one of many tracked down by two ruthless serial killers, but what made her case unique?