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ROCKFORD Tenn. (KSDK) - An O'Fallon, Mo. man has been found dead in a Rockford, Tenn. river.

Sheriff James Lee Berrong says 29-year-old Lance Michael Larson was found in the Little River Thursday evening. He was found one-half mile downstream from the Roddy Branch boat access area off Old Knoxville Highway.

An autopsy has been performed on Larson, but the cause of death is still under investigation.

Sheriff Berrong says they are looking for Larson's vehicle, a tan 2003 four-door Kia Spectra with a Missouri plate of CF1S9R.

Larson traveled to Lynchburg, Va. in February, and his last known contact with family in O'Fallon was around Feb. 20 when he told his parents he was headed back to Missouri.

It is unknown why Larson was in the Rockford, Tenn. area.

Anyone with information about Lance Larson or has seen or spoken to him after Feb. 19 is asked to call the Blount County Communications Center at 865-983-3620, the Blount county Sheriff's Office Criminal Investigation Division at 865-273-5001, the anonymous crime hotline at 865-273-5200 or leave a tip through the Text-a-Tip link on the sheriff's website at www.bcso.com.