How Much Do You Know About America's Worst Serial Killers?

The White House in Washington is seen at night, Monday, Sept. 30, 2013. President Obama is ramping up pressure on Republicans to avoid a post-midnight government shutdown, saying a shutdown would hurt the economy and hundreds of thousands of government wo
Pablo Martinez Monsivais/AP

9. Which Serial Killer Wrote A Letter To The D.C. Sniper, Asking Him To Stop Hurting Innocent People?

Dennis Rader

Gary Ridgway

Ed Gein

David Berkowitz
Contributor

Shannon Enstad hasn't written a bio just yet, but if they had... it would appear here.