Hitman Tommy Monaghan was a victim of an alien parasite attack that left him with telepathy and X-ray vision. An unusually-moral hitman, Tommy used his powers to kill people, animals and demons, and do some good along the way.
I enjoyed the Hitman series by Garth Ennis quite a bit. Off-the-wall humor with over-the-top violence. Strongly recommended if you enjoy that kind of thing.