What happens to Tom in East of Eden?

Tom Hamilton is the third son of Samuel and Liza, and the one who is most like his father. He has a talent for inventing and is even bolder than his father. Remaining a bachelor, he lives on the ranch when everyone else has left. He is delighted when Dessie comes back to live there, but is devastated when she succumbs to an illness. He blames himself for giving her the wrong medicine and commits suicide.