MGH patient stabs doctor, is shot dead

Boston Police report a psychiatric patient was fatally shot by an off-duty security guard after he attacked a doctor with a knife this afternoon in a Mass. General building on Staniford Street.

Police say the security guard, who does not work for Mass. General, shot Jay Carciero, 37, of Reading, "multiple times" after he had stabbed the doctor repeatedly. Both victims were taken to the nearby emergency room; he was pronounced dead, the doctor, identified by the Herald as Astrid Desrosiers, is in stable condition.

Channel 5 posts photos from the attack scene at 50 Staniford St., where Mass. General leases office space.

Police Commissioner Ed Davis talks about the violence.

This is the second knife attack in a Boston hospital in two days. On Sunday, somebody was stabbed in the neck in the Boston Medical Center emergency room. And it's the second attack of any kind at MGH - on Thursday, a man allegedly tried to rape a woman in a hospital restroom.