Horton Rivers: Mass murder, dismemberment, suicide. It all happened right here on this quiet street in the heart of Los Angeles. Within the walls of the once stately manor right behind me, Ada Ritter, aging matriarch of the Ritter home boarding house, routinely murdered her elderly guests for their social security cheques. The bodies were dismembered and buried in the basement. Twelve victims in all. Police speculate there may have been more. Only Ada Ritter, whos suicide prompted the investigation, knew for sure.