HOUSTON -- Houston Police homicide investigators are looking into the death of a man in a double shooting outside a southwest side gas station.

The shootings happened around 8 p.m. Thursday along S. Sam Houston Parkway near Rockwell.

Police believe four men were in a car when a fight broke out. The driver allegedly shot one of the men and then left the scene. He then returned and shot another man in the back of the head, who died at the scene.

The first wounded man was taken to the hospital in serious condition.

Police have not provided a description of the suspect of his vehicle.