The man who beat serial killer Jeffrey Dahmer to death inside a Wisconsin prison recently explained why he did it to the New York Post. Here's a look at Dahmer and other notorious serial killers.
John Wayne Gacy. Before the bodies of 29 young men and boys were discovered on his property in 1978, Gacy was known around Chicago for being nothing more than a friendly neighbor and Pogo the Clown. He was executed in 1994.