Tim Sale, the acclaimed comic book artist behind classic DC Comics such as “Batman: The Long Halloween” and “Superman for All Seasons,” died on Thursday, DC comics confirmed in a press release. He was 66.

DC Comics publisher and chief creative officer Jim Lee announced that Sale had been admitted to the hospital due to health issues on Monday.

The cause of death has not been announced.

In a statement for DC Comics, Lee said: “The entire DC family is heartbroken at the news of Tim’s passing.

Tim was an extraordinary artist, who was masterful at storytelling and panel layouts and his compositions were second to none.

I was always so impressed and inspired by his use of lighting and shadows which infused his work with foreboding gravitas and dramatic noir sensibilities.”

A veteran superhero artist who worked for both DC and Marvel Comics, Sale’s art was distinctive for its clean yet detailed compositions and his heavy use of color to convey mood and tone.