An informant told police that Lloyd Perkins (defendant) confessed to the murder of Richard Stephenson. Police then placed the informant and an undercover officer into the Montgomery County jail where Perkins was being held on unrelated charges. Perkins boasted about the killing to the informant and the undercover officer. Perkins was charged with murder. Before trial, Perkins moved to suppress all statements made to the undercover officer. The trial court granted the motion, and the Appellate Court of Illinois affirmed. The United States Supreme Court granted certiorari.