LAS VEGAS, N.V. - An unofficial spokesperson for the famous over-indulging Heart Attack Grill is believed to have died of a heart attack.

John Alleman, the inspiration for the restaurant's "Patient John" caricature that is featured on the menu and merchandise, suffered a heart attack last week while waiting at a bus stop in front of the eatery, according to the Las Vegas Sun.

Heart Attack Grill restaurant owner Jon Basso says 52-year-old Alleman was taken off life support after 1 p.m. on Monday.

Basso also said that Alleman had a genetic predisposition for cardiac problems. Both of Alleman's parents died from heart attacks while they were in their 50s.

The Vegas restaurant is known for its high calorie menu, which includes a three-pound, nearly 10,000-calorie Quadruple Bypass Burger. The burger is advertised, saying patrons who weigh more than 350 can eat free.

Alleman is the second unofficial Heart Attack Grill to pass away, as the Grill's Blair River, better known as the "Gentle Giant," died of flu-related pneumonia in March 2011.

Rose Heaphy contributed to this article.