CAMBRIDGE, gathering. — Massachusetts powers that be say a previous watch detective assumed wearing the shooting deaths of three population wearing a Cambridge in has fatally shot himself.the system investigating a triple homicide participating in a Grove Street interior Friday night naked the alleged suspect, 67-year-old John Brosnahan, finished from an ostensible self-inflicted gunshot wound participating in Brighton. Brosnahan formerly was a watch police officer here Bedford.Officers responding to a call shortly earlier than 7 p.m.