Police have arrested a man who allegedly shot and killed his ex-girlfriend's boyfriend in San Pablo a few days before Christmas, a police sergeant said Thursday.

San Pablo resident Donte Marquee Smith, 24, was arrested on Tuesday and has been charged in Contra Costa County Superior Court for the murder of 30-year-old DeJuan McDonald and the attempted murder of Schylon Stewart, according to police.

Police said Smith ambushed Stewart, his ex-girlfriend, and McDonald, her new boyfriend, shooting at them as they drove in the 1700 block of Rumrill Boulevard in San Pablo the morning of Dec. 21.

The shooting left McDonald dead and Stewart uninjured.

Police quickly identified Smith as the shooter and have attempted to locate him over the past month.

On Tuesday, investigators located Smith's Nissan Sentra parked in a concealed spot in an apartment complex parking garage in the 500 block of 21st Street in Richmond. Both of the car's license plates had been removed, police said.

Officers set up surveillance on the complex and detained Smith as he left an apartment later that day. He was arrested without incident.

Police said Smith had changed his appearance, which had been broadcast since the murder, by cutting off his dreadlocks.

Anyone with information about this case is asked to call Detective Shawn Ray at (510) 215-3150.