Who to know before the Karen Read retrial starts

Here are the people you should know ahead of the Karen Read retrial starting with jury empanelment on Tuesday.
Also read: The Herald’s guide to the major developments ahead of the retrial.
The victim: John O’Keefe was a 16-year Boston Police officer when he died at 46 in the early hours of Jan. 29, 2022. He was “not only a dedicated police officer, he was an exemplary guardian, son, brother, uncle and friend and we were so fortunate to have him as a part of our lives,” st