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Gary Lee Sampson (September 29, 1959 – December 21, 2021) was an American bank robber and later spree killer who killed three people and was sentenced to death by a federal jury in Massachusetts.
During three days in 2001, Sampson killed three strangers – retiree Philip McCloskey in Marshfield, Massachusetts, college student Jonathan Rizzo in Abington, Massachusetts, and Robert Whitney in Meredith, New Hampshire. He also attempted to kill a fourth victim and stranger, William Gregory, in Plymouth, Vermont. Sampson killed McCloskey and Rizzo after they picked him up hitch-hiking, stabbing them to death. Shortly after that he strangled Whitney. Sampson pleaded guilty to the three killings on September 9, 2003, and was sentenced to death on December 23, 2003, by a federal jury in Massachusetts. He received the death penalty for the two Massachusetts killings, and a life sentence for the New Hampshire case.After Sampson pleaded guilty, a federal jury decided whether he should be sentenced to death or life in prison. The defense introduced mental health experts to testify that Sampson had dyslexia as a child, had bipolar disorder, and "suffered from a significant mental impairment" during the killings. A psychiatrist called by the government testified that Sampson did not have any mitigating mental impairment; he was intelligent but violent and deeply antisocial, with antisocial personality disorder. The jury of 12 unanimously returned a sentence of death.
In 2011, Sampson's death sentence was thrown out due to juror misconduct, and he was scheduled for a second sentencing trial on September 16, 2015. He was again sentenced to death on January 9, 2017. He died in 2021 at the age of 62, presumably from end stage liver disease.