BRAWLEY, Calif. (AP) — Ultimate Fighting Championship star Evan Tanner, a former UFC middleweight champion, has died in the desert east of San Diego, possibly of heat exposure.

Sheriff's Lt. George Moreno says the 37-year-old Tanner was found Monday about two miles from his campsite in a remote area of the Palo Verdes Mountains, where temperatures had reached 110 degrees. Moreno says a preliminary coroner's report suggests Tanner died of heat exposure.