8 P.M. -LRB- CBS -RRB- 48 HOURS MYSTERY : THE MARILYN TAPES -- In a few months -LRB- on Aug. 5 -RRB- , it will have been 44 years since Marilyn Monroe -LRB- left -RRB- , Hollywood 's blonde of blondes , was found lying nude in her Los Angeles bedroom , dead of a drug overdose at 36 .