How did they die?

How did Muhammad, the founder of Islam die? How did Buddah die? How did Sidhartha die? How did budadarma, daruma-san die? Thank you!

Mohammed died of an illness.

Do you know the illness?

No. I don't remember what the sources say off-hand.

And even if I did, you usually can't accurately identify a medical condition from the kind of description you find in ancient and medieval literary sources.