Carolina Panthers RB Jonathan Stewart (hamstring) and DT Vernon Butler (ankle) did not participate in practice Friday, Sept. 30, and have been ruled out for Week 4. DE Charles X. Johnson (quadriceps) did not practice and is listed as questionable. LB Jeremy Cash (hamstring), LB A.J. Klein (non-injury) and LB David Mayo (knee) fully participated in practice and are not on the injury report.