'Heroes'

Killer: Gabriel Gray (played by Zachary Quinto) sheds his old identity and takes the name "Sylar" from a watch brand, as he was raised the son of a watchmaker. Modus operandi: Sylar's special power involves replicating the powers of other characters through contact with their brains, so his method of killing often involves beheading. Still at large? After four seasons of flip-flopping between good and evil, and quite a body count, Sylar eventually mends his murdering ways... or so it seems.
Dean Hendler / NBC Universal
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