A Manchester by the-Sea man has been charged with murder in connection with Saturday morning’s cold-blooded killing of a Mansfield man.

The Bristol District Attorney’s office on Monday announced the murder charge against &nbsp;William O’Brien, 22, of Manchester-By-The-Sea for the alleged killing of Samuel P. Waters, 23, of Mansfield&nbsp; O’Brien had previously been charged with weapons violations in connection with the deadly shooting.

The shooting occurred&nbsp; at 42 West Church St., near Main Street in downtown and the Mansfield MBTA station. The area is heavily residential.

O’Brien, who was already facing charges of carrying an illegal firearm and carrying an illegally loaded firearm, is expected to be arraigned on the murder charges today.

The Bristol District Attorney’s office on Monday announced the murder charge against  William O’Brien, 22, of Manchester-By-The-Sea for the alleged killing of Samuel P. Waters, 23, of Mansfie…{ai:summary}<p>William O'Brien, 22, of Manchester-By-The-Sea charged with murder in connection to the killing of Samuel P. Waters, 23, of Mansfield near the Mansfield MBTA station. O'Brien already facing charges of illegal firearm possession. #crime</p>

Murder charge filed in Mansfield slay

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