Authorities allege Yealu walked into the Venice Boulevard station about 8:30 p.m. on that Monday, approached the front desk and fired a Glock pistol at the two officers there. One of the officers was wounded before the pair returned fire.
Officials said Yealu was carrying extra magazines and had a "heavily modified" AK-47 in his car parked outside. Authorities later found what Beck described as an "armament" of high-powered weapons and hundreds of rounds of ammunition at Yealu's home.
Yealu had also faced gun allegations in connection with the attack. If convicted of all the charges, he faced 75 years to life in state prison, prosecutors said. Still hospitalized, Yealu had yet to enter a plea.
Investigators had been trying to determine what prompted the attack, saying only that before he began shooting, Yealu told the officers he had a complaint.