Every season of 21st Century Serial Killers ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of 21st Century Serial Killers!

Jesse Matthew

Stephen Port

William Howell

James Fairweather

Mark Martin

Shawn Grate

Donna Perry

21st Century Serial Killers forensically researches the lives of the killers who can't stop killing, revealing how the grim opportunities, provided by the 21st century, played a part in a number of murders.

The Best Seasons of 21st Century Serial Killers

Season 1