In Karen Read's retrial, family tensions rise as John O'Keefe's mother and Read's father show differing courtroom demeanors, impacting public perception.

Karen Read’s defense called its first witness on Friday, marking a new phase in her retrial in the killing of John O’Keefe, her off-duty Boston police officer boyfriend whose body was found buried in the snow outside a home in Canton,

Matthew DiSogra said he detected 19 trigger events in Read’s SUV over the preceding eight months. Of those, he said, none “were triggered by a collision.”