Karen Read looks toward her defense attorney Robert Alessi, as special prosecutor Hank Brennan questions Ian Whiffin, a digital intelligence expert with Celebrite, about the data on John O'Keefe's iPhone during her murder retrial in Norfolk Superior Court in Dedham, Mass., Monday April 28, 2025. (Pat Greenhouse/The Boston Globe via AP, Pool) AP

Key witness Jen McCabe took the stand Tuesday in the sixth day of witness testimony in the Karen Read trial after a cellphone expert finished his testimony about McCabe's disputed Google search and John O'Keefe's movements the night of his death. When court was done for the day, Judge Beverly Cannone issued a stern warning for defense attorneys.