On May 23, 22-year-old Elliot Rodger killed six individuals by stabbing or shooting them and wounded 13 others in Isla Vista, Calif. Rodger had legally purchased three semi-automatic guns and ammunition used in the attack (Dillon/Thompson, AP/Sacramento Bee, 5/28).
The incident occurred after Rodger's family members had contacted the Santa Barbara County Sheriff's Department on April 30 with concerns about his mental health. Police conducted a welfare visit and concluded that Rodger did not pose a risk (Pickert, Time, 5/27).