Sandman

Flint Marko is the Sandman (Villain). A radiation project gone wrong caused Flint to turn into Sandman.

Sandman Dies
Later into comics, ​Venom causes Sandman to die by a poison bite. It really happened! Sandman said for Spider-Man to say to his mom "Good-Bye" The reason Venom bit Sandman because maybe... The Carnage Symbiote got into him. Venom absorbed Carnage's Symbiote by the way, so that might be why.