A single mother is murdered at work. The woman was identified as the store’s assistant manager, 24-year-old Vicki Knight. Investigators found no signs of break in but $3100 was missing from the store’s safe.

On the morning of March 27th, 2003 a woman working at church and daycare center in Greenville, Ohio was struck by a disturbing sight. A four-year-old boy wearing blood stained pajamas was standing at the front door.

November 11, 1983, it was checkout time at the Comfort Inn in Santa Fe, New Mexico. But what appeared to be a routine morning at the motel quickly became an unforgettable nightmare when a housekeeper entered room 205 to clean up.

October 23, 1997. It was the middle of the night when a Sheriff’s deputy’s headlights illuminated a shocking sight. It was the lifeless body of young woman, lying on the ground off the side of a dark cemetery’s access road.

Police must connect two vicious murders in order to bring a single killer to justice.

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.

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.

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

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.

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.

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.

Lisl Auman's life is turned upside down when her so-called 'friends' reveal their dark and dangerous sides.

Two young women are raped in Darien, Connecticut. The attacker threatens to kill them if they tell anyone. When police announce that the serial rapist is a popular high school athlete from a prominent family, the story makes front-page news.