Question: how did ibn sina die?
Answer: One theory is that when he served Alā al-Dawla (the Kakuyid military commander) on his march to Hamadan, a slave poisoned him with opium. ... He died in June 1037, in his fifty-eighth year and was buried in Hamadan, Iran. Although decrepit in the early years, Ibn Sina's tomb in Hamadan is now refurbished and restored.