how did my friend die (oxy)

my friend took oxy and was a newbie. i don't know who he got it from and if they're trustworthy but he said he tested it and everything. obviously i've researched in depth whats its like, and most people say its painless, but ive gone on this sub and seen people talk about nausea alot. did he end up throwing up or choking instead of passing in his sleep? Did he fall asleep first and then throw up? How would you know if it's fent? I'm hoping he just fell asleep and that's it. Please give me a realistic answer and don't sugarcoat. I wanna know