April 30, 2024 5:22 pm First responders testify in Karen Read murder trial Jurors in the Karen Read murder trial heard testimony Tuesday from first responders who were called to the scene of the death of Boston Police Officer John O’Keefe. US & World Videos 2:36 Key witness takes stand in Karen Read murder trial 0:20 President Biden to visit Boston, NH Tuesday 2:14 Karen Read trial: Jennifer McCabe returns to the stand Tuesday 0:51 Haitian cultural center breaks ground in Boston 2:05 Gas leak forces evacuations in Lynn