The U.S. Supreme Court has rejected an appeal from an Arkansas death row inmate. The man has been forced to take anti-psychotic drugs that made him mentally competent to be executed. Charles Singleton argued his constitutional rights were violated. A lower court ruled that the forced medication was constitutionally acceptable because it was part of appropriate treatment for Singleton`s paranoid schizophrenia. Singleton wanted the high court to review that lower court`s ruling. Singleton was convicted of killing Hamburg grocer Mary Lou York in 1979, stabbing her to death during a robbery. She identified him as her attacker before dying. The high court rejected the appeal Monday.