"Nature Boy" Kirby, one of pro wrestling's greatest heels from the 1960s to the early 1980s, known for his great physique, blond hair, and handlebar mustache or beard, died on Monday, March 18. He was 79 years old. During his career, he took on every world champion from Pat O'Connor on up. He made his mark in territories like Georgia, Florida, Oregon, Minnesota, and Kansas City.