PITTSBURG, Calif. -- Police arrested a 20-year-old Pittsburg woman Friday and are looking for a second woman in connection with the murder and robbery of a San Francisco man in Pittsburg on Nov. 3.

Kiarra Price was arrested on suspicion of murder, robbery and an outstanding drug warrant at about 11 a.m. after investigators saw her leave her house in the 200 block of Kingsberry Place, Pittsburg Police Lt. Brian Addington said.

Police were still looking for Price's alleged accomplice, 20-year-old Richmond resident Teareney Brown, this afternoon, Addington said.

The victim, Benjamin Merrill, 22, was found shot to death at about 3 a.m. in Marina Walk Park. He had no identification and no criminal record and remained a "John Doe" for two days.

Shortly after the shooting, police issued a flier to law enforcement agencies with a photograph of the victim. Coincidentally, Merrill's cousin, who was watching a trial in San Mateo County Superior Court, happened to look over and see a police officer holding a copy of the flyer, Addington said.

When Merrill's family contacted Pittsburg police and gave them Merrill's name, police were able to look up his fingerprints in the Department of Motor Vehicles database and confirm his identity, Addington said.

He said police were not releasing information today about who they believe actually shot Merrill and were still investigating how he got to Pittsburg and what he was doing there.

The person who reported the shooting allegedly saw a car speeding away from the park just after hearing a shot fired and investigators believe they have recovered the car. They have also recovered Merrill's iPhone, Addington said.

Police expect to present the case to the Contra Costa County District Attorney's Office for filing of formal charges against both women early next week.