Flint Marko (Earth-6531)

"I'm not a bad person, I just have bad luck."

- - Sandman to Spider-Man

Flint Marko is a former small-time criminal and robber who worked alongside Dennis Carradine in order to supply his family with money to cure his daughter, Penny Marko. During a robbery, Marko accidentally killed Ben Parker, where he ran and was later imprisoned, without being discovered as the real killer for years.