Mohammad died from poision given by a Jewish woman who poisoned him as a revenge for killing her family. The following testimony from Aisha, the youngest wife of Muhammad, makes this conclusion valid.
Sahih Bukhari V5, B59, N713 reported:
…Narrated 'Aisha: "The prophet in his ailment in which he died, used to say, 'O 'Aisha! I still feel the pain caused by the food I ate at 'Khaibar, and now, I feel as if my aorta is being cut from that poison." (After a failed attempt to go to Mecca Mohammad and his followers attacked and plundered the weaker Jewish settlement of Khaibar where he was poisoned)
Muhammad died in 632 AD.
Mohammad Din Mohammad died in 2007.
Mohammad Mohammad Sadeq al-Sadr died in 1999.
Mohammad Ghaznavi died in 1041.
Ghaus Mohammad died in 1982.
Mohammad Habib died in 1971.
Mohammad Zainuddin died in 1850.
Mohammad Mokri died in 2007.
Nazar Mohammad died in 1996.
Mohammad Jusuf died in 2004.
Mohammad Shamsuzzoha died in 1969.
Mohammad Boroujerdi died in 1983.
Mohammad Sa'ed died in 1973.