The Karen Read trial is continuing on Tuesday as Dr. Marie Russell is back on the stand for additional cross-examination after she first took the stand a day earlier to testify that she believed John O'Keefe's injuries were caused by a dog,

Karen Read's defense attorneys cross-examine key accident expert Judson Welcher in a dizzying day of testimony.

A medical doctor testified in the Karen Read murder trial that she believes wounds to John O’Keefe’s arm were “inflicted by a dog.”