January 26, 2014 3:43 am Witness to Boston Marathon bombing shares his story Bruce Mendelsohn was in his Boylston Street office when the blasts happened; he rushed into the chaos to help a woman and her son US & World Videos 0:59 Jury seated in Karen Read murder trial, hearing for outstanding motions Thursday 1:33 Ice Cube talks basketball: The Big 3 league, how far the Celtics can go, and more 2:31 Mike Gorman retires as voice of the Celtics 1:27 Ex-Holyoke city councilor facing child sex abuse charges appears to join Russian military 1:21 Dana-Farber Cancer Institute retracts 7 studies