Writer, editor, publisher, producer, and cameo star Stan Lee passed away last night at the Cedars-Sinai Medical Center in Los Angeles, his family has confirmed, before finding out what happens in the next Avengers movie.

Lee started out in comics in 1939, at the time responsible for topping up ink bottles and buying lunches for other employees, before making his writing debut in 1941 with Captain America Foils the Traitor’s Revenge, featured in Captain America Comics #3. His subsequent career credits include a who’s-who list of Marvel superheroes – Spider-Man, the Hulk, Doctor Strange, the Fantastic Four, Daredevil, Black Panther, the X-Men, Ant-Man, Iron Man, and Thor – created in collaboration with artists like Jack Kirby and Steve Ditko, and his brother and co-writer Larry Lieber.

Since his retirement as Marvel editor and writer in 1972, Lee remained a prominent personality in the entertainment industry with a number of other publishing, TV, and film projects, even working with DC Comics on its Just Imagine series in the 2001.

“He felt an obligation to his fans to keep creating,” his daughter Joan Celia told press. “He loved his life and he loved what he did for a living. His family loved him and his fans loved him. He was irreplaceable. My father loved all of his fans. He was the greatest, most decent man.”