2. Thurston High School shooting
In May 1998, Kipland Kinkel shot and killed his parents before going on a shooting rampage at his high school that left two students dead and wounded 22 others. Mr. Kinkel was 15 at the time.
Just days before his trial was set to begin in 1999, Kinkel pleaded guilty to murder and attempted murder, and was sentenced to 111 years in prison without possibility of parole. As part of his guilty plea, he relinquished the possibility of being acquitted by reason of insanity.
In 2007, Kinkel sought a new trial, saying that his attorneys should have used an insanity defense and taken the case to trial, but his plea was denied.