Son of deceased relative , 6 , says death of relative is first step towards justice . `` He killed four people , including a pregnant woman . Viewer response led to arrest of suspect in fatal Thanksgiving shooting . John Michael Merhige was arrested Saturday at motel in Florida Keys . Couple who called police lifted tarp to check license plate on Merhige 's car .
Son of deceased relative , 6 , says death of relative is first step towards justice . Viewer response led to arrest of suspect in fatal Thanksgiving shooting . John Michael Merhige was arrested Saturday at motel in Florida Keys . Couple who called police lifted tarp to check license plate on Merhige 's car .