Monroe had died between 8:30 p.m. and 10:30 p.m. on August 5, and the toxicology report revealed that the cause of death was acute barbiturate poisoning.
Diperkirakan bahwa Monroe telah wafat antara pukul 20:30 dan 22:30, dan laporan toksikologi kemudian menyatakan bahwa sebab kematiannya adalah keracunan barbiturat akut.