Sean Murphy

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Sean Murphy, 18, was arrested and charged with sexually assaulting a 17-year-old girl. He was among the more than 50 taken into custody Saturday night at a Keith Urban concert in the Boston suburb of Mansfield. (WBZ)

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** FILE ** In this Friday, April 19, 2013, photo provided by the Massachusetts State Police, Boston Marathon bombing suspect Dzhokhar Tsarnaev lifts his shirt while standing in a boat at the time of his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy)

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** FILE ** Massachusetts State Police Sgt. Sean Murphy, right, a tactical photographer, and his son Connor Patrick Murphy, arrive at State Police Headquarters for his hearing to determine his duty status after he released images of the arrest of the Boston Marathon bombing suspect, in Framingham, Mass., Tuesday, July 23, 2013. (AP Photo/The Boston Herald, Ted Fitzgerald)