Judge Beverly Cannone denied Karen Read a mistrial in her second murder trial in the killing of her police officer boyfriend John O'Keefe on Tuesday.

Karen Read is accused of killing her Boston police officer boyfriend. Her defense says she was framed. A dog is at the heart of their case.

A dog bite expert was cross-examined Tuesday by prosecutors in Karen Read’s second murder trial, as the defense argues she was framed for killing her boyfriend, Boston Police Officer John ...