Flint Marko (Earth-21997)

William Baker (later legally known as Flint Marko) is an associate of the mob boss Adrian Toomes. He is the father of Penny Baker, a young girl suffering from a terminal illness. He is transformed into the "Sandman", an enemy of Spider-Man, although he redeems himself and goes on to live a relatively normal life with his daughter. Spider-Man lets William get away scot-free from a robbery so he can use the money he stole to pay for his daughter's medical bills.