Police said the 24-year-old gunman, Alwyn Gibson II of Texas, surrendered in Irvine at around 2 p.m. Saturday after a five-hour standoff.
The standoff occurred at the home of his ex-girlfriend's family.
According to police, a 60-year-old man was killed, and the victim's wife and son were wounded.
Gibson's ex-girlfriend was not at the home at the time.
About 10 surrounding homes in the neighborhood were evacuated during the standoff.