The judge overseeing Karen Read’s retrial on murder charges in the death of Boston cop John O’Keefe cut off the defense’s final witness Wednesday morning after he told jurors he had three children and wished his 10-year-old a happy birthday.
“So I was going to say I have three kids, a 9-year-old who’s actually turning 10 today – happy birthday Kai – and I have two older ones,” said Dr. Andrew John Rentschler, a biomechanical engineer and accident reconstructionist from a firm called ARCCA…