From the October 27, 2009 Boston Globe:
A patient in a psychiatric center near the Massachusetts General Hospital stabbed his doctor this afternoon before being shot dead by an off-duty security guard, police said.
The physician is in stable condition, Police Commissioner Edward F. Davis said at a press conference this afternoon as he described a chaotic scene.
A relative said the victim was Dr. Astrid Desrosiers, a Massachusetts General Hospital psychiatrist who worked at the center. Isabellie Desrosiers, Desrosiers' sister-in-law, said she had been told by Desrosiers' sister that Astrid had been shot. Police identified the patient late this afternoon as 37-year-old Jay Carciero of Reading.
The actions of the security guard, who does not work at the hospital, were hailed as "heroic" by Bonnie Michelman, head of security for Massachusetts General Hospital.