"Nixon, who participated in the Panthers' three-day rookie camp as an invited tryout player in May, has played for three different NFL teams. Undrafted out of Brigham Young in 2009, the 6-3, 225-pounder has seen action in 15 games for the Oakland Raiders, Houston Texans and St. Louis Rams. In another pre-training camp transaction, the Panthers have waived running back Armond Smith. Carolina had claimed Smith off waivers from the Cleveland Browns on May 15."