This undated photo provided by the Massachusetts Bay Transportation Authority shows transit police officer Richard Donohue, 33, who was critically injured in an early morning shootout Friday, April 19, 2013, with the two suspects in the Boston Marathon bombings. (AP Photo/Massachusetts Bay Transportation Authority)

Associated Press
This undated photo provided by the Massachusetts Bay Transportation Authority shows transit police officer Richard Donohue, 33, who was critically injured in an early morning shootout Friday, April 19, 2013, with the two suspects in the Boston Marathon bombings. (AP Photo/Massachusetts Bay Transportation Authority)
This undated photo provided by the Massachusetts Bay Transportation Authority shows transit police officer Richard Donohue, 33, who was critically injured in an early morning shootout Friday, April 19, 2013, with the two suspects in the Boston Marathon bombings. (AP Photo/Massachusetts Bay Transportation Authority)
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