A retired California-based doctor who testified as an expert witness for the defense in Karen Read's first trial will be back on the stand Tuesday. Prosecutors are trying to exclude future testimony from Dr.

A defense expert in the Karen Read case spent hours on the stand Tuesday explaining and defending her work on dog bite analysis ahead of Read’s second trial later this year. Read is accused of hitting her Boston police officer boyfriend John O’Keefe with her SUV and leaving him to die in the snow in Canton,

A key defense expert in the Karen Read case returned to the courtroom on Tuesday to resume a hearing to decide whether her testimony will be permitted in the upcoming second trial.