The story of a Canadian cult leader who ran a commune in Ontario.

Profiling Leslie Joseph Gall, a self-confessed con man known as the “Sweetheart Swindler,”who romanced elderly women and then robbed them. Gall was convicted in 2004 on 39 counts of fraud and identity theft.

Profiling Ed Hicks, a man accused of bigamy after his wife discovered his other marriages when filing a joint tax return.

A look at the topic of religious leaders who allegedly steal from their congregations.

Examining the case of Christopher Rocancourt, a con man who scammed his victims by using several aliases and faking family ties to the rich and famous.

An Oregon woman's family members are slain, prompting a statewide search for the killer.

The crimes of Arizona serial killer Mark Goudeau are detailed.

The bodies of a woman and her daughter are found in the Rouge River in Dearborn Heights, Mich., and the investigation reveals that the crime may be linked to another murder in Detroit.

A killer remains at large for decades after murdering a family.

Con artist Michael Ritter, who was convicted of bilking millions of dollars from investors in his pyramid scheme, is profiled.

A man has recurring nightmares about a murder he witnessed as a youth.

A woman finds human remains in a driveway in Hamilton, Ont.

An attack on a homeless woman provides clues to the identity of an elusive serial rapist.

Recalling the case of a New Mexico man who allegedly kidnapped and tortured women.

A seemingly charming new resident of a rural Alabama town is linked to a deadly house fire.

The body of a teenage girl is found in Elkhart, Ind., a week after her disappearance, sparking a manhunt for her killer.

A serial killer strikes in rural Northern California.

A Seattle doctor is attacked outside his home, and the investigation leads to a violent ex-cop who may be linked to another crime from nine years earlier.

A serial killer stalks young men in Louisiana.

A serial arsonist is hunted in Washington, D.C.

A 2011 arson investigation in Texas leads to a widespread hunt for a sexual predator.

A gunman terrorizes Orange County, Cal.

An Indiana nurse becomes suspicious when the death toll at her hospital quadruples over two years.

New evidence comes to light in a cold case involving a serial killer who targeted gay men in the early 1990s.

Two Texas teenagers go missing.