The families of three victims slain during a southern California rampage last year that left dead six college students and the killer are suing the county, the sheriff's department and the apartment building where the victims were killed. The parents of George Chen, Weihan Wang, and Cheng-Yuan Hong filed the federal suit on Monday, alleging that the defendants failed to recognize signs that the attacker, 22-year-old Elliot Rodger, was a danger and take action. Rodger fatally stabbed the three men, two of whom were his roommates assigned by management at the Capri Apartments at Isla Vista, in the dwelling last May before fatally shooting three more people, wounding 14 others near the campus of the University of California at Santa Barbara, and killing himself. The lawsuit pointed to several “red flags,” including racist remarks Rodger made about previous roommates and other violent, erratic behavior, and alleged that the apartment managers did not investigate before assigning new roommates.