True-crime author Harold Schechter, author of 'Hell's Princess: The Mystery of Belle Gunness, Butcher of Men,' on what made serial killer Belle Gunness unique and if she tricked everyone into believing she died.

Serial killers often live fairly ordinary lives with normal employment, enabling them to blend in with colleagues. Their legitimate jobs also offer them one more key perk: an opportunity to help carry out or conceal their crimes, according to experts.

Andrew Walsh, deputy chief of the Las Vegas Metropolitan Police Department, on how he used a mannequin as a decoy to catch a suspect in the murders of two homeless men.

Melissa Moore, daughter of Keith Jesperson, otherwise known as the Happy Face Killer, talks to A&E True Crime about what it was like as a child to learn her dad was a serial killer.

Wayne Williams has been in prison for almost 40 years after being convicted of murdering two men. Although he was never tried or convicted, the murders of 29 kids and young adults were attributed to him as well.

German serial killer nurse Niels Hoegel is suspected of killing more than 300 patients at two hospitals in Germany. Beatrice Yorker, an expert in serial killings in health arenas, tells us how killers in medical professions often get away with the crime.

Although not as well known or remembered for their horrific deeds as serial killers are, serial rapists exert control through terrifying means.

Read an excerpt of the true-crime book "The Man From the Train: The Solving of a Century-Old Serial Killer Mystery" of the murder of the unorthodox Schultz family of Houston Heights, Texas.

Thomas Hargrove of the Murder Accountability Project talks about the 2,000 or so serial killers he believes are prowling U.S. streets now.

A&E True Crime spoke with Dr. Gail Saltz, clinical associate professor of psychiatry, about why the serial killer was so well-behaved after he was locked up.