"In regards to the picture that is circulating... It was early last year and the shirt simply matched my shoes," Butler tweeted. "In no way do I support the message written on the shirt. I sincerely apologize to any of my fans who may have been offended. Much love, JB."
Butler, a first-round draft pick in 2011, emerged as a key player for Chicago in his second season and will be the starting shooting guard going into next season, according to coach Tom Thibodeau.