How did chris mccandless from the book into the wild die?

Chris McCandless (Alexander Supertramp) died of starvation from either eating a Wild Potato Seed or a fungus on a plant he ate. He died 25 miles away from a town called Healy, inside of Fairbanks City Transit System Bus 142. The bus is located on the Stampede Trail and is now a tourist attraction for fans of Into the Wild.