Death / Martyrdom of the Prophet - Ramadan Reflections 30

The Quran makes it clear to Muslims that we are not a cult of  personalities. We do not worship people – neither Prophets, Messengers,  Imams, nor scholars. We worship Allah. However, as Prophet Muhammad  plays such a prominent role in Islam, some people felt that it would be  hard to continue on without him – however Allah would remind the Muslims  that we must continue – as death will occur to everyone. Do we have a  conclusive answer as to what happened to the Prophet? Did he die a  “natural death” due to old age? Was it the poison he was given during  the event which took place in the Battle of Khaybar? Or did someone  else, perhaps someone close to him, force something into his mouth while  he was sick and on his death bed in Medina as some hadith have clearly  noted? Do we know those people? Do we know their motives? Do we know if  they poisoned the Prophet in his last days on this Earth?