What drugs caused the overdose of Marilyn Monroe?

Marilyn Monroe's autopsy report stated that Nembutal, Seconal, and Chloral Hydrate were found in her system, and listed as the drugs that caused her death. Nembutal is a sleeping pill used to treat insomnia. Seconal is also used to treat insomnia. However, it is used more to help someone stay asleep as opposed to falling asleep. While Marilyn had prescriptions for those two drugs, none of her doctors admitted to prescribing her Chloral Hydrate, which is also a sedative.

It was assumed that Marilyn overdosed while by herself. It is not known whether the overdose was done on purpose or by accident. However, speculation remains to this day whether or not Marilyn really did kill herself, or if her death was the result of a more sinister plot.