Chiron is credited with inventing medicine, a topic in which he instructed the heroes -- a good thing too since the athletic heroes must have made ample use of a short course in sports medicine. In the story of Phineus and the Harpies, Jason uses this received instruction to remove the curse of blindness from the king's eyes.
During a fight with the Ixion-sired Centaurs, Herakles accidentally wounded Chiron with a poisoned arrow. Chiron willingly gave up his immortality in order to die. Hyginus (2.38) says he was placed among the stars as either the constellation Centaurus or Sagittarius.
Source: "Achilles' Teachers: Chiron and Phoenix in the 'Iliad'," by C. J. Mackie; Greece & Rome,(1997), pp. 1-10.
Chiron lived with his wife, the nymph Chariclo, and their children on Mt. Pelion.