Misspelled again. It's Lou Gehrig's Disease. Named for NY Yankee Hall of Famer Lou Gehrig, who died of this disease in 1941, just two years after his famous retirement ceremony in Yankee Stadium in 1939.
It's medical name is Amyotrophic Lateral Sclerosis, and it's a degenerative nerve disease. As the disease progresses, the brain loses its ability to communicate messages to the muscles in the body. As a result, muscles weaken and atrophy. Physical movement gets more and more difficult, until finally, it becomes impossible. There's no cure.
Marty is one of the finest and most decent men I've ever known, and my heart goes out to his family.