A 79-year-old man was fatally shot while sitting in a Bedford-Stuyvesant barbershop yesterday by a gunman aiming for someone else, police sources said.

The victim, Andrew Burke, a daily visitor, was talking to someone in Fest’s Barbershop at 358 Marcus Garvey Boulevard at about 5:30 p.m. when the shooter chased another man into the shop and fired 10 shots.

“A dude runs in, a guy behind him starts shooting, then I just hit the floor,” said the shop’s owner, who asked not to be identified.

The luckless senior was struck at least once in the torso, and was pronounced dead at Interfaith Hospital.

Sharron Stallings, who lives in the building, said she heard a commotion and heard people yelling “No! No! No!”