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By Phil Helsel

Authorities in Utah believe prolonged exposure to the elements may have contributed to the death of the brother of reality TV star Kristin Cavallari.

Grand County Sheriff Steve White said there were no signs of major trauma on the body believed to be that of Michael Cavallari, which was found in a steep and rocky area near an exit about five miles from where his car was discovered almost two weeks earlier.

No suicide note or drugs or alcohol were found, White said. Temperatures in the area have been in the 30s during the day and in the high teens and low 20s at night, he added.

Michael Cavallari's Honda Civic was discovered on Nov. 27 about 100 feet off of Floy Wash Road, around five miles south of an exit on Interstate 70 in Grand County, the sheriff's office said.

Credit card receipts and surveillance video last put him near a convenience store in Monticello, Utah, about 100 miles south of Interstate 70, at around 3:30 a.m. on the day his car was spotted, the sheriff's office has said.

Kristin Cavallari is married to Chicago Bears quarterback Jay Cutler and she formerly starred on the MTV reality shows "Laguna Beach" and "The Hills."

The medical examiner's office will determine a cause of death, which is pending toxicology tests that could take six to eight weeks, White said.