Mentally unstable fan who murdered John Lennon on December 8, 1980.
He was a summer camp counselor at YMCA in the 1970s, once winning the Outstanding Counselor award.
He made a not guilty insanity plea, but was sentenced to 20 years to life for second degree murder.
He married Gloria Hiroko Abe in 1979.
He infamously shot John Lennon four times in the back in 1980.