William Russo, also known as Billy "The Beaut" Russo or by his villainous nickname, Jigsaw, is a supervillain and enemy of The Punisher from Marvel Comics.
The following is taken from Wikipedia.
Billy Russo was a professional criminal and brutal assassin for the Maggia crime family, nicknamed "the Beaut" because of his good looks. He was also a favorite assassin for the Costa crime family. After the executiob-style killings that inadvertently led to the deaths of Frank Castle's family, Russo was hired by Bruno Costa to assassinate another assassin who had failed to kill Frank Castle as well. Russo kills all of his targets but Castle, who narrowly avoids death in an explosion. Hours later, Castle returns and tracks down Russo to one of the Maggia's nightclubs. Several criminals were killed, and Russo was thrown through a glass pane head-first. He survives with his face torn to shreds; because of the extent of the facial damage, surgeons stitch it back together like a jigsaw puzzle.
Taking advantage of his now hideous visage, the formerly handsome gangster took on the identity of Jigsaw, and initially attempts to frame the Punisher for murder. However, the plan failed due to the intervention of Spider-Man and Nightcrawler; Spider-Man witnesses one of Jigsaw's murders and one of his victims was an old friend of Nightcrawler. Jigsaw later battled Spider-Man again.
Jigsaw is an athletic man with no superhuman powers. During his time in prison he was able to hone his physical strength to a level comparable to the Punisher. He has extensive experience with street-fighting techniques, and familiarity with a variety of weapons and criminal techniques. He carries various handguns as needed. He has been known to wear a special exo-skeleton in his outfits.
Though lacking any formal military training, Jigsaw is an exceptional strategist and tactician. His unorthodox pattern of operation makes him more difficult for the Punisher to anticipate than the majority of Punisher's enemies. Before Jigsaw was disfigured he was a highly charismatic leader and criminal organizer; after the accident only the latter trait remained.