David Bautista, 20, was arrested Friday as he was seen walking away from his residence.
Authorities say Bautista is one of the suspects responsible for the murder of Juan Cisneros.
The victim was driving a vehicle near the intersection of Hamilton Boulevard and First Street in Pomona when he was shot last month.
Cisneros drove a short distance and finally stopped at White Avenue and Second Street. He was then taken to a hospital but later succumbed to his injuries.
During the later investigation, Pomona detectives were able to link Bautista to the crime.
The shooting is believed to have been gang-related.
Detectives are asking for the public's assistance in helping to identify additional suspects that may have been involved in Cisneros' murder.
Anyone with information was urged to contact the Pomona Police Department Detective Bureau at (909) 620-2085.