 But Lynceus spied Castor and discovered him to Idas, who killed him.Pollux chased them and slew Lynceus by throwing his spear, but in pursuing Lynceus he was wounded in the head with a stone thrown by him, and fell down in a swoon.In revenge, the divine father of Pollux, Zeus, smote Idas with a thunderbolt and carried up his son to heaven where he shared his immortality with his mortal brother, Castor.