A Bronx man surrendered to police for punching a man and causing him to fall to the ground and fatally hit his head, police said.

Christopher Butts turned himself in early Monday and was charged with assault in connection with Friday’s attack.

The 29-year-old was fighting with another man in front of a bodega on East Mt. Eden Avenue near Jerome Avenue shortly before 1:30 a.m. when 57-year-old Milton Pena tried to intervene, prompting Butts to punch him in the face.

The impact of the punch sent Pena falling to the ground, where he hit his head on the sidewalk, police said. He was rushed to Bronx Lebanon Hospital, but could not be saved.

Butts has four prior arrests, including two for assaults, police said.