Because many of the videos were removed from YouTube then re-added in the week leading up to the killings, it's unclear which of the videos alarmed his family, or whether others were reported that were not uploaded again.
He voices his contempt for everyone from his roommates to the human race, reserving special hate for two groups: the women he says kept him a virgin for all of his 22 years and the men they chose instead.
At least two other people who saw Rodger's videos before Friday compared him to a serial killer, through a message board on a bodybuilding website and the social network Reddit.
The rampage played out largely as he sketched it in public postings, including a YouTube video where he sits in the BMW in sunset light and appears to be acting out scripted lines and planned laughs.
"I'll take great pleasure in slaughtering all of you," the son of a Hollywood director who worked on "The Hunger Games" says in the video posted Friday and taken down by YouTube Saturday with a message saying it violated the site's terms of service.
