The Walking Dead is filled with many different kinds of characters. Some are good guys, some are bad guys, but most are deeply conflicted and at least a little bit of both. Some have died while others live on to terrorize others. Which of the "bad guys" were the worst of the worst? Please add any missing bad guy characters.
http://www.ranker.com/list/best-walking-dead-_tv-series_-villain/lanayoshii,
the Governor
Shane Walsh
Merle Dixon
Ed Peletier
Joe
Lizzie Samuels
Mary
Martin
Caesar Martinez
Gareth