Elliot Rodger, the suspect in Friday's deadly rampage, is the son of a long-time filmmaker in Hollywood, Peter Rodger, a second unit director for the first of the "Hunger Games" movies.
Late Saturday, CBS affiliate KEYT obtained what it said was Elliot Rodger's 141-page manifesto, called "My Twisted World."
It says, "This is the story of my entire life. It is a dark story of sadness, anger and hatred."
On Saturday, a family attorney said Elliot Rodger's parents long had concerns about their son's mental health.
"He had multiple, and I'm telling you multiple, therapists," Alan Shifman said. "He had a social worker who as recently as last week was concerned and who's the one that actually called the police."
Speaking in front of Peter Rodger's home, Shifman told reporters that the shooter's family alerted authorities after Elliot Rodger posted a series of disturbing, ranting messages on YouTube.
"They reported this weeks ago," Shifman said. "There was an investigation by the police department."
Shifman said Elliot Rodger had been diagnosed at a young age with Asperger's syndrome, a mild form of autism, but did not have a history of gun use.
Shifman also said the family was devastated and would cooperate in any way possible with investigators and police.
"This is the tragedy of the most extreme," Shifman said. "They want to send their deepest condolences to all of the victims' families involved."
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