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In page John Patler:

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On August 25, 1967, Patler shot and killed Rockwell while Rockwell was getting into his car, which was parked in front of a self-service laundry at an Arlington, Virginia, shopping center.[6] Rockwell was shot with a 7.63mm Broomhandle Mauser pistol. Patler was arrested half an hour later, about a mile from the scene of the shooting.[7] Patler was convicted of first-degree murder on December 16, 1967 by an Arlington jury and subsequently sentenced to 20 years in prison by Arlington Circuit Court Judge Charles Russell.[7] Patler was paroled from prison in 1975, after having served less than eight years of his sentence. After later violating his parole, he received an additional six-year sentence.[8]