Deadshot a deadly assassin, whose real name is Floyd Lawton, first appeared in Batman #59.
Deadshot is one of the eight assassins hired by Black Mask.
While in Arkham City, Hugo Strange contracts Deadshot to kill six targets who threaten to interfere with his plans for the city, the last three of which are Jack Ryder, Bruce Wayne and Batman. In the first few minutes of gameplay in Batman: Arkham City, Deadshot is one of the first criminals that talks to Bruce Wayne. He gestures to shoot Wayne while informing him that he is on his "list". Deadshot is able to find and kill the first three of his targets, however Batman manages to find and analyze each of the crime scenes, eventually discovering a chemical Deadshot has left behind which is used in certain electrical substations in Arkham City. After discovering a phone hidden by Deadshot in one of the substations Batman discovers his target list and the schedule he's working to, stopping him just before he manages to kill Ryder. Deadshot then turns his sights on Batman, but sneaking past him, Batman is able to get to a grate beneath him and take him out. He then locks him in a stationary tram car, saying he'll send Commissioner Gordon for him later.
The Suicide Squad film version is an alternate skin for Deathstroke in Injustice: Gods Among Us' mobile version.