Vanished! Kristin Cavallari's Brother Michael Has Been Missing For 11 Days

Authorities Monday were searching for Kristin Cavallari's brother Michael, who's been missing for 11 days.

Michael's 2014 Honda Civic was recovered in Monticello, Utah, according to officials, who said that the last record of the reality star's brother — a San Clemente, California native — was a gas station surveillance tape filmed Nov. 27.

The Civic was recovered off Interstate 70 sporting damage on its side as result of collision with a rock, according to Grand County Sheriff Steven White, who added that the airbag was out and the motor was still running.

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"We're combing the area for anything we can find," White told KSL . "We're deeming it suspicious, but there's nothing to indicate anything one way or another. The vehicle was just abandoned."

Michael Cavallari's computer and phone were recovered from the automobile, officials said.

Michael, whose brother-in-law is Chicago Bears quarterback Jay Cutler, is described as a slender man with brown hair and a beard, standing 5 foot 11, officials said, adding that the last time he was spotted he was wearing a green sweatshirt and jeans.

Anyone with info on his whereabouts is asked to contact the Grand County Sheriff's Office at 435-259-8115.