According to Fox, Rodger's therapist called his mother:
It was Friday night when Elliot Rodger's mother got a call from her sonís therapist that he had emailed a ranting manifesto about going on a deadly rampage.
The mother went to her son's YouTube channel and found the video in which he threatens to kill people. She alerted authorities and set off frantically with her ex-husband to Santa Barbara.
By the time they arrived, it was too late: their son had killed six people and then, authorities say, himself. Elliot Rodger