Patrick "Crazy Pat" Henry Sherrill (November 13, 1941 – August 20, 1986) was a United States Postal Service employee who, on August 20, 1986, in Edmond, Oklahoma, killed 14 employees with two .45 caliber pistols at his workplace before turning one of the guns on himself and committing suicide. Six other employees were wounded. Security expert Gavin de Becker said that postal authorities ignored numerous signs of Sherrill's unstable and hostile attitude.
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The incident is credited with inspiring the American phrase "going postal".