Elizabeth Diane Frederickson Downs (born August 7, 1955) is an American convicted murderer. She was born Elizabeth Diane Frederickson in Phoenix, Arizona. In Oregon on May 19, 1983, she shot her three children and then shot herself in the arm. On June 17, 1984, she was convicted of murder, attempted murder and assault and sentenced to life imprisonment. Downs has been diagnosed with three cluster B personality disorders: antisocial, histrionic and narcissistic.