Patrick Campbell , 27 , named a person of interest in murder of his grandmother , 64-year-old Darlene Robertson . Woman was found by her son in a pool of blood in her Florida , New Smyrna Beach , home . Police say Robertson suffered blunt force trauma and cuts to her stomach . Campbell is considered mentally unstable and anyone who encounters him should call police .
Patrick Campbell , 27 , named a person of interest in murder of his grandmother , 64-year-old Darlene Robertson . Woman was found by her son in a pool of blood in her New Smyrna Beach , Florida , home . Police say Robertson suffered blunt force trauma and cuts to her stomach . Campbell is considered mentally unstable and anyone who encounters him should call police .