A Bronx gas station worker was critically injured after he was shot in the head Tuesday night, police said.

The 49-year-old victim was in critical, but stable condition after an unknown suspect approached the man inside the business and fired at him, the NYPD said.

Authorities said the incident occurred shortly after 7 p.m. near the corner of Boston Road and Astor Avenue at a Sunoco gas station.

The suspect was still on the loose Tuesday night, police said.