According to UFC CEO Dana White, Jones, 37, informed the promotion of his decision to retire Friday. The UFC had been working toward booking a heavyweight title unification bout between Jones and interim champion Tom Aspinall, but with Jones' sudden retirement, Aspinall is now elevated to undisputed champion. "Jon Jones called us last night and retired," White said during a news conference in Azerbaijan, where UFC Fight Night took place. Tom Aspinall is the heavyweight champion of the UFC." Tom Aspinall is a good guy.