I heard drowning originally. When I heard he was found in a hot tub, I remembered all the substance abuse issues he'd been fighting since the 90s-early 2000s. To be clear, I don't know if this was related to drugs or alcohol at all, but with a 54 year old drowning in a tub, it's not beyond the pale. I was a big fan of his when I was younger...its an odd feeling when public figures from your childhood start dying in greater numbers.
I hope the people close to him have the support they need. RIP buddy, thanks for laughs.