Dr. Seuss cheated on his wife while she was sick with cancer for 13 years. She committed suicide because of his infidelity, and he later married his mistress.
Probably not the most uplifting story for one of the most beloved children’s book authors of all time, but there it is. Seuss’ wife, Helen Palmer Geisel, suffered from a long series of illnesses including cancer over a period of 13 years. Eventually, Helen learned of her husband’s adulterous relationship with another woman. Given that and the constant illnesses she suffered, Helen decided to commit suicide through an overdose of barbiturates.