I asked Perplexity what people are speculating online might have been the cause of his death, and it mostly appears to revolve around mental health issues, substance abuse & self harm. Whether or not it's true, this is a tragic loss. Smart & talented people can often be very sensitive.
Having struggled with these same issues for most of my adult life I'll just say it's nothing to be ashamed of and if you or someone you care about is in pain or struggling, don't hesitate to reach out. There are resources out there for you and it doesn't make you weak for using them.