Some guys you can tell just by looking at them...Something ain't right. After meeting them, most people say "he gave me the creeps" or "I need to take a shower" after only a few minutes. Profiled here are the creepiest of the creepy, serial killers such as Mark Twitchell. Online dating has become the norm for many of us. Busy lives, children, sometimes working two jobs in order to provide as a single parent, means that it's not so easy anymore to meet people in 'real life'. But this profile is different - this profile belongs to prisoner Mark Twitchell, a convicted murderer who used one of the most popular dating sites around to lure his victims to an empty garage, where he hoped to satisfy his lust for blood. His first attempt went wrong, and his victim got away - the next was not so lucky.