The letter, addressed to Boston Police Commissioner Michael Cox and obtained exclusively by 25 Investigates, alleges Officer Kelly Dever’s credibility is “irreparably compromised”.

Boston Police officer Kelly Dever, formerly with Canton Police, testifies during the murder retrial of Karen Read in Norfolk Superior Court, in Dedham, Mass., Monday June 2, 2025.

Crime Ex-Canton cop alleges Karen Read’s lawyers threatened her with perjury in combative back-and-forth "They did not want me to tell the truth," Kelly Dever, now a Boston police officer ...

Boston Police officer Kelly Dever, formerly with Canton Police, testifies during the murder retrial of Karen Read in Norfolk Superior Court, in Dedham, Mass., Monday June 2, 2025.

kelly dever is now a boston police officer, but used to work for the canton police department and was in the dispatch room the day john o’keefe’s body was found.

Boston Police Commissioner Michael Cox was asked Thursday for the first time about references to him and his department during testimony in the Karen Read trial.