An autopsy will be performed, said coroner's spokesman Powell Caesar in Cleveland. He had no details on Pekar's death, according to the AP.
Pekar's wife called police to the couple's home in Cleveland Heights around 1 this morning, said police Captain Michael Cannon. Pekar had been suffering from prostate cancer, asthma, high blood pressure and depression, Cannon told the AP.
Pekar's "American Splendor" comics, which he began publishing in 1976, chronicle his grousing about work, money, and the monotony of life. His life story -- cowritten by Pekar -- was made into the 2003 "American Splendor," with Paul Giamatti portraying Pekar.
Pekar's cranky appearances on David Letterman's show were infamous. They usually ended with the two men yelling at each other, raising the question of why Letterman ever invited him on the show -- and why so often. Take a look at a couple of clips:
The AP's full story is below.
The cause of death was unclear, and an autopsy was planned, officials said. Pekar had prostate cancer, asthma, high blood pressure and depression, said Michael Cannon, a police captain in suburban Cleveland Heights.
Officers were called to Pekar's home by his wife about 1 a.m., Cannon said. His body was found on the floor between a bed and dresser. He had gone to bed around 4:30 p.m. Sunday in good spirits, his wife told police.
Pekar took a radically different track from the superhero-laden comics that had dominated the industry. He instead specialized in the lives of ordinary people, chronicling his life as a file clerk in Cleveland and his relationship with his third wife, Joyce Brabner. His 1994 graphic novel, "Our Cancer Year," detailed his battle with lymphoma.
The dreary cover scene shows him sprawled beside his wife on a snowy curbside with shopping bags on the ground. "Harvey, forget about the groceries, honey. Let's get you inside first," she says.
Pekar never drew himself but depended on collaborations with artists, most notably his friend R. Crumb, who helped illustrate the first issue of the ironically titled "American Splendor," published in 1976. It was made into an acclaimed 2003 film starring Paul Giamatti as Pekar. The most recent "American Splendor" was released in 2008.
"Harvey was one of the most compassionate and empathetic human beings I've ever met," Giamatti said in a statement. "He had a huge brain and an even bigger soul. And he was hilarious. He was a great artist, a true American poet, and there is no one to replace him."
Pekar's quirky commentary developed a following, and his insights and humor were often a bit on the dark side.
Lucy Shelton Caswell, curator of the Billy Ireland Cartoon Library & Museum at Ohio State University, said it was inaccurate to describe Pekar's work as "cult."
"His work was accepted by the mainstream," Caswell said. "It was bought by public libraries and read widely." The cartoon library has all of Pekar's works in its collection, she said.
"He will be remembered as an innovator who wrote stories about ordinary things that were then illustrated by some of the most notable cartoonists of the late 20th century," Caswell said. "People identified with what he was writing about and the stories that these people were drawing because it was so ordinary."
In 2003, the New York Film Critics Circle honored "American Splendor" as best first film for the directing-writing team of Shari Springer Berman and Robert Pulcini. Part feature and part documentary, and with occasional animated elements, the film's tearing down of the fourth wall -- with Giamatti, as Pekar, often appearing alongside the real Pekar -- paralleled his comic's realism.
Pekar, himself, introduces the film and the character based on him: "This guy here, he's our man, all grown up and going nowhere. Although he's a pretty scholarly cat, he never got much of a formal education. For the most part, he's lived in ... neighborhoods, held ... jobs and he's now knee-deep into a disastrous second marriage. So if you're the kind of person looking for romance or escapism or some fantasy figure to save the day, guess what? You've got the wrong movie."
Pekar, who was a repeat TV guest of David Letterman, told the Associated Press in a 1997 interview that he was determined to keep writing his "American Splendor" series.
"There's no end in sight for me. I want to continue to do it," Pekar said. "It's a continuing autobiography, a life's work."