Walt Harris won't compete at UFC Fight Night in Washington, D.C. while his stepdaughter remains missing, his manager told Marc Raimondi of ESPN.
Aniah Blanchard, 19, has been missing since Oct. 24. Police suspect she is a victim of foul play.
Harris was scheduled to face Alistair Overeem in the main event Dec. 7. It's unclear if Overeem will face a replacement opponent.
UFC president Dana White and light heavyweight champion Jon Jones each pledged a $25,000 reward for the return of Blanchard. As of Thursday, other contributions brought the reward to $80,000.
Harris, 36, was coming off two straight victories, earning Performance of the Night honors after both.