Preview: After Simeonette Mapes-Crupi was killed, police made notes of how the crime scene was in a state of extreme disarray ...

Preview: Simeonette Mapes-Crupi was described by her students as "supportive" and "kind" before her untimely murder.

Preview: Jonathan Crupi frantically calls 911 to report his wife, Simeonette Mapes-Crupi, had been killed--but who did it?

Trying to piece together the events that led to Tracy Holloway's death, Kelly Siegler and Steve Spingola reenact the violent ...

Investigative journalist Casey Sherman gives details on Albert Desalvo's murder just hours before he was going to recant his ...

Kelly Siegler sits down with local investigators to find out what happened to Tracy Holloway.

On tape, Albert Desalvo admits to murdering Mary Sullivan, but was his confession wholly truthful?

Find out more about the allegations against Keon King, who has been charged with murder in the death of Kada Scott.

Learn more about the revelations in Virginia Giuffre's new memoir, including allegations against Prince Andrew, Jeffrey ...

Oxygen uncovers shocking new details about one of the most chilling cases in American history with “The Boston Strangler: ...

Learn more about serial killer John Wayne Gacy's two wives, Marlynn Myers and Carole Hoff, and family life before his arrest.

Find out how California detectives solved the cold-blooded murder of a 19-year-old college student in a love triangle that ...