Who or what killed Mozart?

Wolfgang Amadeus Mozart was born in January 27 in 1756 and he died in December 5 in 1791. The mystery of who or what killed Mozart? Has not been solved, many histories had been created since Mozart died. Some people said that Mozart was killed by his rival Salieri, before his last presentation, he was poisoned by Salieri. Other said that he was killed by his student by the same way; the reason in that case is because his student was the lover's Mozart's wife. In another hypothesis said that Mozart became crazy when he was composing the Requiem, he neither sleep, nor eats, later he was ill and died. Another theory said that Mozart died because he like ate much pig's meat, and that food could sick him. In our times many investigations had been made for discover what was the real reason for Mozart die, but many people like that the mystery continued, because is more exciting. What would you like?