Just stated so on UFC conference call. Has cited pressure, personal issues & obsession as the reasons.
He also said that he had made this decision before fighting Hendricks & wasn't sure whether or not to announce it after the fight or not & this is why he was awkward in the post fight interview.
Dana White confirms Hendricks will fight Lawler at UFC 171 to determine the new champion. So that means UFC 171 has two title fights.