Elliot Rodger was killed as he engaged Sheriff's deputies who responded to the scene. He died from a gunshot wound to the head, although it's unclear if it was self-inflicted.
The Associated Press says the lawyer claims police interviewed Elliot and found him to be a "perfectly polite, kind and wonderful human."
"My client's mission in life will be to try to prevent any such tragedies from ever happening again," the lawyer said. Adding, "This country, this world, needs to address mental illness and the ramifications from not recognizing these illnesses."