A man was shot to death on his porch Monday night, apparently by his live-in girlfriend's brother, police said.

The assailant fired several shots into the chest of 26-year-old Charles Simmons just outside his apartment at the Brookwood complex, 3854 W. Rockwood Way (3390 South). The man died before paramedics arrived, minutes after the 8:30 p.m. shooting, said West Valley Police Lt. Lynn Hanson."The victim was arguing with the suspect's sister," Hanson said. "The brother stepped in to protect his sister and the argument escalated. Witnesses heard the victim say: `What are you going to do? Shoot me?' "

Police were still looking for the suspect Tuesday morning.

Matthew Jones, who lives next door to the to Simmons, heard about seven gunshots and people screaming, he said. Police later recovered at least four 9mm shell casings at the scene.

"The window of my bedroom is right next to (the victim's) porch," Jones said. "I ran out and saw a bunch of people gathered around him trying CPR. Then I heard a car squeal off."

Officers believe the brother was driving a purple Chevrolet Impala but didn't find the man or the car Monday night. Investigators were questioning the girlfriend to get information about the argument and her brother's whereabouts.

"I don't know what they were arguing about or what exactly the problem was," Hanson said. "The sister has calmed down a bit now and she's talking to the officers and detectives. We're trying to find out where the brother might go."

Residents of the apartment complex say the brother wasn't shy about flashing a gun. David Childs, who lives in the complex, saw a black and silver handgun on the brother last week.

"He threatened me with it a week ago," said Childs, 17. "I'm not really sure why."

Police weren't sure if the brother lived in the apartment complex, Hanson said.