The Edmond post office shooting was a mass shooting that occurred in Edmond, Oklahoma, on August 20, 1986. In less than fifteen minutes, 44-year-old postal worker Patrick Sherrill pursued and shot several coworkers, killing 14 and injuring another 6, before committing suicide. It is currently the deadliest workplace shooting in U.S. history by a lone gunman, as well as the deadliest mass shooting by a lone gunman in the state of Oklahoma.
The attack, among other similar incidents of violence perpetrated by postal workers, inspired the American phrase "going postal".
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