World's Most Evil Killers - Season 9

Examining the crimes of Glen McCurley, who in 1974 abducted 17-year-old Carla Walker from a bowling alley car park and killed her before leaving her body in a ditch

An in-depth look at the life and crimes of William Devin Howell who was found guilty of the murders of seven different women

An in-depth look at the life and crimes of Michael Bruce Ross who was executed in 2005 after murdering eight women across Connecticut and New York.

A profile of serial killer Donald Henry Gaskins who stabbed, shot, drowned and poisoned more than a dozen people in South Carolina in the 1970s.

From 1979 to 1981, at least 28 children and youths were murdered after vanishing from predominantly Black neighborhoods of Atlanta, sparking terror in the community.

An in-depth look at the case of David Marmolejo, who was convicted of the brutal murder of his own mother in 2009

In the 1990s, Bridgeport was a violent place. So when several woman were found murdered, the deaths were never linked. A decade later, a cold case team made a startling connection.

Westley Allan Dodd exterior concealed a man with sadistic urges. By the age of 28, he was responsible taking the lives of three young boys.

In 1993, police officers pulled over a young man for erratic driving. Within the car, they found the body of a murdered woman.

To some, nurse Charles Cullen was a friendly face, always willing to lend a hand. None suspected what he really was: a relentless and ruthless killer.