Michael Cavallari, brother of former Hills star Kristin Cavallari, has been reported missing after his 2014 Honda Civic was found abandoned Nov. 27 on Utah's I-70.

Authorities launched a search of the immediate area, but failed to turn up the driver. Credit card receipts, however, pointed police to security cameras at a Monticello, UT convenience store where Michael was definitely identified as the driver.

Kristin and her husband, Chicago Bears quarterback Jay Cutler, have yet to make a public statement.

The Grand County Sheriff's Department asks that if anyone has information on Michael's whereabouts, please contact them at (435) 259-8115 or at their website, www.grandcounty sheriff.org.

Source: Eonline.com