The attack on a doctor at a Massachusetts General Hospital building isn't the first time in recent years an MGH doctor was a target of deadly violence. The last time, the case ended in a mystery.
In 2003, Dr. Brian McGovern, a prominent cardiologist, was shot by a secretary, Colleen Mitchell.
Police said Mitchell shot the 47-year-old doctor four times on April 8, 2003, then killed herself.
When authorities closed their investigation, they were unable to determine a motive. Hospital officials said there were no complaints about Mitchell's work performance or behavior and no indication that McGovern and Mitchell had anything other than a professional relationship.
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