Adolfo Gramajo, 35, was booked on a murder charge with bail set at $4 million after shooting his two young sons in Los Angeles.
The victims, four-year-old Jimmy Gramajo Bonilla and 11-year-old Osmani Gramajo Bonilla, died from close-range gunshot wounds to the head after a custody visit.
The suspect attempted suicide following the shooting and remains hospitalized while police investigate the motive behind the attack.