The Sniper is one of the supporting antagonists of Machete. His real name is never revealed. He appears in both the original faux-trailer from Grindhouse and the feature film.
He is played by Shea Whigham in the feature film.
The Sniper is depicted as being the right-hand man of the mysterious Well-Dressed Man. During Machete's assassination attempt on a senator, the Sniper shoots him in the shoulder. He is later captured by a gang of Mexicans, who bring him to a chop shop owned by Machete and kill him with a circular saw.
As with the faux-trailer, the Sniper is the right-hand man of Michael Booth (the film's version of the Well-Dressed Man) and is responsible for shooting Machete during Machete's assassination attempt on a senator. He also shoots the senator (named John McLaughlin in this version) in the leg to frame Machete as a radical assassin.
The Sniper later tracks down Machete at a hospital, but Machete escapes and kills many of the Sniper's men in the process. He continues to pursue Machete and finds him at Luz's house, but Machete again survives the attempt on his life. As a result of these failed efforts, Booth is forced to kill the Sniper after Rogelio Torrez taunts Booth for tolerating failure. To appease Torrez, the Sniper is strangled with a wire in front of a webcam. Booth later shows remorse for killing his top henchman.