Every season of Ireland's Most Evil Killers ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Ireland's Most Evil Killers!

Ireland's Most Evil Killers delves into the sordid world of some of the most notorious murderers the country has ever seen. The gripping five-part series examines the disturbing cases of five of Ireland's most infamous killers: Joe O'Reilly, Colin Whelan, Catherine Nevin, Charlotte and Linda Mulhall, and Eric Locke.

The Best Seasons of Ireland's Most Evil Killers

The Best Seasons of Ireland's Most Evil Killers