A doctor testifying as a dog bite expert was cross-examined by prosecutors Tuesday in Karen Read 's second murder trial, as the defense argues she was framed for killing her boyfriend, Boston Police Officer John O’Keefe, and that wounds on his arms came from an animal.

Read, 45, is accused of fatally striking O’Keefe with her SUV and leaving him to die in the snow outside another officer’s home when she dropped him off at a party in January 2022 after the two had been drinking. She's charged with second-degree murder , manslaughter and leaving the scene outside Boston.

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