Police said surveillance video shows the suspect retrieve a firearm from his vehicle and shoot the victim once in the back. He died at the scene.

HOUSTON — Police are looking for a murder suspect who they say shot and killed a man Monday morning in southwest Houston.

LaMarcus Morris, 33, has a pending murder charge after police say he gunned down his ex-girlfriend's boyfriend.

It happened in the 8300 block of Cobblefield Lane around 6:30 a.m.

Police said the victim and his girlfriend were at home when Morris, the woman's "estranged" boyfriend, attempted to gain entry.

The victim argued with Morris and it escalated into a physical confrontation.

Police said surveillance video shows Morris retrieve a firearm from his vehicle and shoot the man once in the back. He died at the scene.

Morris fled in a black Cadillac Escalade and is still on the run, according to police.