Update: Family of shooter say they warned police about videos he posted at YouTube weeks ago warning about suicide and killings. Those videos still posted. Their lawyer says police interviewed the youth and found him police and stable and with no history of gun play.
Earlier: Father of suspect in mass California shootings last night was second unit director on Hunger Games and director of documentary film Oh My God, featuring Hugh Jackman, Ringo Starr and others, trailer below (which I remember seeing) and interview with him about it. I guess with dad as director not a shock that kid would leave behind disturbing videos.