David Boreanaz and Ed Westwick are among Michelle Trachtenberg's famous castmates who have spoken out following her tragic death at the age of 39. "So very sad. Horrible news. RIP and prayers to her and her family,

Michelle Trachtenberg’s boyfriend has spoken for the first time since the “Gossip Girl” actress’s sudden death. Jay Cohen, a Hollywood talent agent, was at the Los Angeles home he shared with Trachtenberg on Wednesday when he answered the door and responded to a reporter’s question for comment.