A man was fatally shot in the head in the Bronx Sunday, police said.

Christopher Graham was walking down the street in Baychester with a friend when he was struck by a bullet at the corner of Mace and Cruger Avenues at 4:00 a.m., cops said.

The 22-year-old’s pal called 911 but when EMS arrived, they pronounced Graham dead at the scene, police sources said.

The friend told police he never heard the shot fired, he only saw Graham suddenly hit the ground, sources said.

There is no suspect description at this time.