No celebrity or famous person has commited suicide by hanging. Their death is actually from one of these two scenarios:
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A hitman who is known by government officials hangs the victim and makes it appear to be a suicide. The victim is either an enemy to some nefarious government agency or legislation plan (Aaron Swartz), it might be done as a way to make the victim appear dead while actually giving them a way out of their situation, so that they can create a new identity (Epstein), it could include famous celebrities who simply do not wish to perform anymore (Robin Williams) or perhaps were cancelled or fired for having knowledge they were threatening to reveal (Anthony Bourdain). Either way, this assassin is capable of infiltrating prisons and hospitals and knows how to manipulate the media and government death systems.
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Auto-erotic asphyxiation. Not intended to be a suicide but things going horribly wrong as they skirt death's reach while chasing an orgasm. (David Carradine, Thomas Midgely Jr.) However, the more it appears to be a death by AEA, the more likely it actually is the first type (Trevor Moore).