The shooting happened around 4:15 a.m. in the 1400 block of Phoenix Drive, according to police.
Officers arrived on the scene to find a victim suffering from at least one gunshot wound. The victim was pronounced dead at the scene.
No suspect information was available, and an investigation into the homicide is ongoing.
Anyone with information about this crime is asked to call Fairfield police at (707) 428-7600, the 24-hour police tip line at (707) 428-7345 or Crime Stoppers at (707) 644-7867. Callers may remain anonymous.