RANCHO CUCAMONGA -- After deliberating for a day and a half, a jury panel found Luke Kang guilty of fatally beating his mother with a golf club last year.
Jurors announced they'd reached a verdict Wednesday afternoon in West Valley Superior Courthouse.
Kang was convicted of willful, deliberate and premeditated murder in the first degree and assault by means likely to produce great bodily injury.
They also found the allegation that Kang, 28, used a deadly weapon when he attacked his mother on Feb. 22, 2012, at their home in the 11500 block of Stoneridge Drive in Rancho Cucamonga to be true.
Because Kang previously pleaded not guilty by reason of insanity, the same jury panel will have "to determine whether the defendant was or was not legally insane at the time of the crime," Judge Colin J. Bilash said.
Jurors will come back for the second portion of the trial - the sanity phase - on Wednesday. Testimony in that phase is expected to last three to four days, Bilash said.
Kang punched, stomped and eventually hit his mother, Hannah Kang, with a golf club after they returned home from a trip to Los Angeles.
When Luke's father Ezra Kang tried to stop the beating, Luke turned and attacked him, causing facial injuries.
A neighbor eventually called 9-1-1, and San Bernardino County sheriff's deputies arrived and arrested Luke Kang.
Hannah Kang, 60, was airlifted to a hospital where she died the following day.
When asked why he had attacked his parents, Luke explained to law enforcement that he had previously had Lasik eye surgery, which didn't work. He blamed his parents, who he said had different shaped heads, for the surgery's failure and called his mom evil for having a flat head.