An autopsy was to be performed by the state medical examiner to determine the cause of death of a body found Sunday west of Lehi by motorcyclists.

According to Utah County sheriff's detective Doug Witney, the body of an unidentified man in his mid-30s was discovered at about 11 a.m. in a rugged area about three miles west of Fairfield near the Utah County/Tooele County border. Detectives believe the death may have been self-inflicted but are not ruling out foul play. The man's name is being withheld pending determination of cause of death.Detectives found a gun near the body but are uncertain whether it was used in the man's death. The man was found near his vehicle, which had been driven over some rough terrain and came to rest against a tree.

Detectives said the man was last seen Friday and could have been dead for as long as two days when he was found. A toxicology test will be performed to determine if the man was intoxicated at the time of death.