In 1993 Wimber was diagnosed with sinus cancer. He had successful radiation treatment which lasted a year, but said "at the time I weighed 280 pounds." In 1995 he had a stroke. In 1997 he had triple-bypass heart surgery. His mental faculties were declining and later that same year Wimber fell in his home and hit his head. This caused a massive brain hemorrhage, from which he died on November 17, 1997, at Western Medical Center in Santa Ana, California. He was 63 years old.