X-Cutioner
The X-Cutioner (Carl Denti) is a fictional character appearing in the Marvel Comics universe. He is a former FBI agent obsessed with stalking Mutants who kill humans, and uses an array of both alien technology (such as Shi'ar power armor and Z'nox sensors) and Earthly technology (such as Sentinel propulsion units) in his quest. He first appeared in Uncanny X-Men Annual #17, in 1993.
Fictional character biography
Carl Denti's father was an army officer murdered for following an illegal order, which would later interfere with his crusade against mutants. Eventually ending up as an F.B.I. officer, Denti partnered with a contact of Charles Xavier's, Fred Duncan, who was a member of the Xavier Underground, a network of mutant supporters. Duncan maintained mutant criminal records and stockpiled weapons and technology from X-Men foes. Denti, an aspiring agent, takes the files, weapons, and technology for himself and assumes the name X-Cutioner, with the proclaimed mission of killing any mutant that has killed other people first. Denti is so "dedicated" to his mission that he will use lethal force to stop anyone from obstructing his lethal justice.