Psychological autopsies, performed by forensic psychologists, are used to try to resolve cases where a murder may be mistaken for a suicide.

After Diane Staudte's husband and son died, and her daughter was hospitalized, an investigation showed she, and her favorite daughter, Rachel, were responsible for their deaths.

The reign of the bodybuilding world's most famous couple, Sally and Ray McNeil, ended after Sally murdered Ray with a shotgun in 1995.

From German nurse Niels Högel to U.K. doctor Harold Shipman to American nurse Charles Cullen, some serial killers target their patients.

Amish men are rarely prosecuted and jailed for sexual abuse against children. What's being done to expose these crimes?

We speak with Deborah Marion, mother of murdered NBA star Lorenzen Wright and Darren Goods, a lead investigator in Wright's homicide case.

The murder of a Chinese woman by her American husband in Columbia, Missouri was a long and painful case for police investigators, attorneys and, most of all, her parents.

An Airman who grew up in a Mennonite family came to resent the faith so much, he murdered a young Mennonite woman.

In October 2003, eight-year-old Josef Smith was beaten to death by his parents, Joseph and Sonya Smith. The Smiths were members of a church that promotes disciplining children in a way that some have said is abusive.

In 2010, Lawrence Ray, a 50-year-old ex-con, formed a sex cult at his daughter's dorm room at Sarah Lawrence College in New York and humiliated, tortured and trafficked members for his pleasure and monetary gain.

Detective Lindsey Wade on the experience of solving the 1986 cold case murder of 13-year-old Jennifer Bastian from Tacoma, Washington.

Robyn Maharaj, co-author of 'Grilling Dahmer' with Milwaukee detective Patrick Kennedy, tells us about the late detective's experience with the serial killer.

Author Barbie Latza Nadeau on how Italian women have played vital roles in mafia history, and have done anything—from keeping secrets to murder—for their families.

Advocates for Lyle and Erik Menendez, who murdered their parents in 1989, recently initiated a petition to Governor Gavin Newsom to free the siblings. After more than 30 years behind bars, is there any chance they will walk out of prison?

In 1971, Edgar Smith Jr. became a free man after spending more than 14 years on death row. In 1976, he was sent back to prison.

We speak with author William Rawlings about 'The Stocking Strangler,' a serial killer who raped and strangled women, often with their own stockings, in the 1970s.

The British-American anti-virus software pioneer was found hanging in his cell in a Spanish prison hours after a court ruled that he would need to return to the U.S. to face tax evasion charges. But his inner circle has doubts about the manner of his death.

We speak with Wendell Stradford, a retired NYPD cold case detective, about his investigation into Bruce Blackwood's murder and how he acquired a brutally detailed confession from the killer.

In 1997, the 19-year-old British au pair was charged with the first-degree murder of 8-month-old Matthew Eappen.

The mystery of the Zodiac Killer still enthralls the public.