In August 2021, officials from SFPD’s Property Division were conducting an inventory when they noticed a missing firearm. SFPD launched an investigation, which led to the termination and arrest of retired San Francisco Police Officer Mark Williams.
Williams was working for SFPD part-time under the city’s Prop F program, which allows retired employees to work a limited amount of hours to help meet staffing shortages.
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He voluntarily surrendered himself at San Francisco County Jail, where he was booked on charges of unlawful possession of a machine gun, possession of a silencer and embezzlement.
In a separate incident, Officer Kevin Lyons and Officer Kevin Sien were arrested in connection to an incident involving the destruction of evidence on the 700 block on Mission Street on July 2, 2021.
Both officers were assigned to Tenderloin Police Station at the time of the incident. Lyons, a 21-year veteran and Sien, a five-year veteran, were transferred to assignments with no public contact.
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On April 15, 2022, an arrest warrant was issued for both officers and they surrendered themselves voluntarily. Lyons was cited and released on two charges of destroying or concealing evidence. Sien was cited and released on one charge of destroying or concealing evidence.
“The actions of these SFPD members violate the law and regrettably fall far short of our department’s shared values,” said San Francisco Police Chief William Scott.
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