Yust was charged with knowingly burning in relation to Runions' vehicle, which was found burned in Kansas City in a remote area just off of Blue River Road Saturday.
Yust is the former boyfriend of Kara Kopetsky, a Belton teen who went missing in a highly publicized case in 2007 and has still not been found. Kopetsky's mother says just days before her daughter disappeared they filed a restraining order against him.
Yust has also been in trouble in the past on drug trafficking charges, as well as animal abuse charges.
Yust is now being held in the Benton County jail.
Missouri Search and Rescue have searched two large areas twice, but Runions' remains missing.
Anyone with any information is asked to call the TIPS Hotline at (816) 474-TIPS.