Michael Powell Jr., 19, and Nickie Donald Jr., 20, are suspected of shooting 22-year-old Donald Espinoza-Ordonez at 100 Larkspur St. on Nov. 30, 2009, police spokeswoman Margo Rohrbacher said.
Both suspects are from Richmond but Powell had moved to Glendale, Ariz., and was arrested there on Wednesday, Rohrbacher said.
Donald was arrested in Contra Costa County Jail where he is being held on a separate and unrelated charge, Rohrbacher said.
Powell got into an altercation with someone in front of 100 Larkspur St. on the day of the murder and went back to Richmond, she said.
Rohrbacher said Powell returned to the San Rafael address with Donald a short time later to look for the person he had fought with and allegedly ended up shooting Espinoza-Ordonez several times at about 9 p.m. Both suspects then fled.
Espinosa-Ordonez's body was found in a courtyard of the apartment complex.
He was not the man who had the altercation with Powell, and the fatal shooting is believed to be a case of mistaken identity, Rohrbacher said.