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The official cause of Monroe's death was classified by Dr. Thomas Noguchi of the Los Angeles County Coroners office as "acute barbiturate poisoning", which he recorded as an accidental overdose. Eight milligram percent of chloral hydrate and 4.5 milligram percent of Nembutal were found in her system after the autopsy.Her death was rumored to be a "probable suicide", but because of a lack of evidence, investigators could not classify her death as suicide or homicide. Also, some conspiracy theories involve John and Robert Kennedy with her death, while other theories suggest CIA or mafia complicity.

When did the person die or disappear?
Marilyn Monroe died On August 5, 1962.
What is the official version of how the person died or disappeared?
Investigators could not classify her death as suicide or homicide.
What other explanations are there?
Some conspiracy theories involve John and Robert Kennedy with her death, while other theories suggest CIA or mafia complicity.