A Boston police officer who testified at Karen Read’s retrial that she falsely remembered seeing the Canton police chief and a Bureau of Alcohol, Tobacco, Firearms, and Explosives agent alone with Read’s SUV for a lengthy period has resigned, officials said Monday.

Kelly Dever resigned from the Boston Police Department effective Sept. 1, a spokesperson said. Her resignation was previously reported by NBC Boston.

Dever provided key testimony during the retrial of Read, who was acquitted in June of killing her boyfriend in Canton in January 2022.

Prosecutors said Read , 45, had backed her SUV in a drunken rage into Boston police Officer John O’Keefe after dropping him off outside a Canton home, but her lawyers said she was framed and that O’Keefe entered the property, owned at

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