It’s been a month since testimony began in Karen Read’s second trial for the murder of John O’Keefe, and the new trial has brought a notable change in presentation.

A brain surgeon testified at Karen Read's second murder trial Wednesday that the victim's skull was most likely fractured when he fell backward and hit his head.

Karen Read is again standing trial for allegedly killing her boyfriend in Canton three years ago in a crime saga that has captured national attention. We broke it all down.