Fourth Man Charged In Brutal Marshfield Murder

PLYMOUTH, Mass. (CBS/AP) — A Boston man was arraigned Wednesday in connection with the violent slaying of a Marshfield man.

State police arrested 40-year-old Mark O'Brien Tuesday night on murder and burglary charges, Plymouth County District Attorney Timothy Cruz said.

He was arraigned in Plymouth District Court Wednesday.

Robert McKenna, 45, was found dead in his Marshfield home on Sept. 16. He had suffered massive blood loss from several stab wounds.

O'Brien is the fourth man arrested in the incident.

James Ferguson, Michael Moscaritolo and Lauren Kalil previously pleaded not guilty to murder and other charges.

O'Brien's lawyer Jack Atwood did not immediately return a call seeking comment.

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