Santa Barbara Shooting: Who Was Elliot Rodger?

The suspect detailed his mass murder plot in a chilling manifesto and disturbing videos.
4:44 | 05/26/14

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Transcript for Santa Barbara Shooting: Who Was Elliot Rodger?
Indeed and the killer, Elliot Rodger's plot had come during the course of the past year all detailed in a chilling manifesto and disturbing video he left behind. ABC's Clayton Sandell is at the apartment building where his deadly rampage began with the latest. Good morning, Clayton. Reporter: Good morning, Lara. This morning, Elliot Rodger's parents who are divorced are not speaking publicly. But now we are learning that just moments before this all began, their son sent an ominous warning. Just minutes before Elliot Rodger began his sinister attack, his mother knew something was wrong. Forced me to suffer all my life and now I'll make you all suffer. Reporter: Family friends Simon astaire tells ABC news that chin Rodger had taken a call telling her to check her e-mail. Waiting in her in-box that manifesto detailing Elliot's jealousy and hatred especially for women who he blamed for a life of loneliness, rejection and misery. It was 9:17 P.M., only 13 minutes before the shooting started. Chin then checked her youtube page. What she found confirming her worst fear. Well, this is my last video. It all has to come to this. Reporter: Astaire says Elliot's mother frantically called her ex-husband peter Rodger and later police. The two racing from Los Angeles to Isla vista, along the way radio reports brought news of a shooting. When they reached the police station officers confirmed the shooter was their son. He was really, really upset about why is the world so unfair to him. Girls gave their affection and sex and love to other men but never to me. I'm 22 years old and I'm still a virgin. Reporter: We now now Rodger's family contacted police only weeks earlier concerned about his increasingly disturbing online rants, sheriff's deputies went to his apartment. They determined that he didzv not meet the criteria for an involuntary mental health hold. Reporter: They found no reason to take action but Rodger wrote that it would have been different if police had found his guns and his assault plan. If they had demanded to search my room, he wrote, that would have ended everything. Rodger's manifest at the describes a life of deprivation and unfairness but his Facebook page shows a life of privilege, designer sunglasses and private concerts with Katy Perry. His dad, an assistant director on "The hunger games." Elliot even posted this picture on the red carpet. Images of a glamorous life that apparently masked a dark reality. Now, because Elliot Rodger was never institutionalized for mental illness it was perfectly legal for him to buy those three handguns along with hundreds of bullets. David? Our thanks to you. I want to bring in chief legal affairs anchor Dan Abrams and it's always easy looking back with hindsight on these things but the call and the e-mail from the therapist to the mom, this was just minutes before the shootings began and a lot of people are going to wonder had the therapist only called police, maybe something could have been done. A very long manifesto+o%u)u$ very little time, and the laws do vary state to state. There's no question that this therapist would have been allowed to call the police without worrying about the privilege. The question is, was it mandatory? Did this therapist have to call the police? It does seem under California law that a therapist can be required to call the authorities to warn, to protect most importantly if, if the victims are identifiable and this manifesto it does seem that particular people were named so an argument could be made that the psychologist was obligated to protect the victims in this case but because it was such a long manifesto and so little time it's going to be very fact specific? We also know the police called authorities before the sheriff's deputies had gone to the home and one thing written, the police interrogated me outside for a few minutes and says if they demanded to search my room that would have ended everything. For a few horrible seconds I thought it was all over then the biggest wave of relief. That's what he writes. This wasn't a search warrant, right. They didn't have the right to go in there. They were there for a welfare check, to make sure that he was not a danger to himself or to others. The police made it pretty clear that in talking to him, there was no real risk at least that they could tell. So very easy to section-guess, tough to blame the police in retrospect. Without a search warrant you can't go in. Thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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