Who killed Shivaji Maharaj?

Who killed Shivaji Maharaj? It is a controversial topic as it is still unknown if Maharaj was killed or died naturally. Shivaji Maharaj left this world in 1680 on 3rd April at the age of 52. It was the day of Hanuman Jayanti. The reason behind his death is unknown: different claims say different reasons, Portuguese recorded cause of death of Shivaji Maharaj is anthrax. Britishers say Bloody flux - Dysentery killed Maharaj Mughals say blood vomit. Krishnaji Anant Sabhasad say reason is fever. Some say he was poisoned by enemies (I personally don’t think this, as he had food tasters) Many say he was poisoned by his wife Soyrabai with assistance of minister Annajidatto to make Rajaram king. I don’t think he was poised by his close ones as no one would dare to do it. Also Maharaj’s minister had feud or disputes with Sambhaji Maharaj as Annaji’s corruption was always questioned by Sambhaji Maharaj after he started taking care of capital fort when Shivaji Maharaj was in battlefields. If Soyrabai and Annaji Datto wanted to make Rajaram next king, why will they kill Maharaj? Annajidatto tried to poison Sambhaji Maharaj but he failed due to alertness of guards and food tasters. Maybe Annaji poisoned Maharaj without knowledge of Soyrabai… God knows what happened, but Annaji was later sentenced to death by Sambhaji Maharaj for betrayal of Swarajya as he tried to help Siddis of Janjira. So it is natural to doubt his minister. There was no caste dispute between Sambhaji Maharaj and Annaji Datto like Brahmin vs. Maratha. This thing was bought to create tension between both communites. Some say Shivaji Maharaj died due to natural reasons as he never had luxury life, living in tents during wars, on horse and also he later he stopped himself fighting in wars due to knee pains and arthritis; and used to travel in palkhi. He never stayed at home for rest . So So due to very heavy, and busy life, he may have died due to natural reasons. But, whatever may be reason of his death, whole Bharat was in shock and an unusual strange feeling was felt by other Indian kings and Indians. Jay Hind!