THE KILLER AT THURSTON HIGH Thursday, May 13, 60 minutes FRONTLINE [Repeat] 9 P.M. on PBS (check local listings) In May 1998, a year before the massacre at Columbine High, fifteen-year-old Kip Kinkel shot his father in the head and waited in the garage for his mother to come home. He told her he loved her before shooting her six times. He then went into his bedroom, listened to his favorite music, and strapped ammunition to his body. The next morning, Kip drove the family car to Thurston High and opened fire in the school cafeteria. In the end, two...