https://www.hollywoodreporter.com/heat-vision/steve-ditko-dead-spider-man-creator-was-90-1125489

Marvel Comics legend Steve Ditko, who co-created Spider-Man and Doctor Strange with Stan Lee, has died, reportedly from a heart attack. He was 90.

In 1961, Ditko and Lee created Spider-Man. Lee, the editor-in-chief at Marvel Comics, gave Ditko the assignment after he wasn't satisfied with Jack Kirby's take on the idea of a teen superhero with spider powers. The look of Spider-Man — the costume, the web-shooters, the red and blue design — all came from Ditko. Spider-Man first appeared in Amazing Fantasy No. 15. The comic was an unexpected hit, and the character was spun off into The Amazing Spider-Man. Ditko helped create such classic Spider-Man characters as Doctor Octopus, Sandman, the Lizard and Green Goblin. Starting with issue No. 25, Ditko received a plot credit in addition to his artist credit. Ditko's run ended with issue No. 38.

In 1963, Ditko created the surreal and psychedelic hero Doctor Strange. The character debuted in Strange Tales No. 110, and Ditko continued on the comic through issue No. 146, cover dated July 1966.

Ditko had a falling out with Lee and left Marvel. However, he did return in 1979, "where he worked on Machine Man and the Micronauts."

He and Lee hadn't been on speaking terms in years, and he was a bit reclusive compared to Mr. Cameo.

RIP

Edit: Futher reading

His comics were legendary.