In the 15th-season finale, McCoy faces a man (Joseph Lyle Taylor) who insists on being his own defense counsel after he's charged with multiple counts of murder for causing a train derailment. Falco: Michael Imperioli. Fallon: Giancarlo Esposito. James Buckley: Matte Osian. Dr. Procope: Reg E. Cathey. McCoy: Sam Waterston.