The fighter was known as one of the most dangerous boxers in the sport and competed in the UFC at welterweight, middleweight and light heavyweight.
One of his biggest fights was when Anthony Johnson made his UFC debut on June 12, 2007 in Hollywood.
One of Johnson's closest friends was former UFC welterweight champion Kamaru Usman, who said he was a private person who tried to keep his condition a secret.
Johnson retired from the UFC in 2017 after losing his second belt to Cormier, but made a brief return with Bellator in 2021 before his health deteriorated