Dahmer on Dahmer: A Serial Killer Speaks

25 years ago, Jeffery Dahmer confessed to 17 gruesome murders that shook America to its core. Journalist Nancy Glass investigates one of history's most terrifying cases.

Those closest to Dahmer shed light on the serial killer.

Nancy Glass' definitive interview with Jeffrey Dahmer becomes even darker as they discuss the most shocking aspect of his crimes -- cannibalism -- and dive even deeper into the mind of the world's most notorious serial killer.