Who was Emmitt Smith's backup at Dallas?

Smith, the National Football League's all-time rushing leader with 18,355 yards, was supported by many running backs during his career with the Dallas Cowboys (1990-2002). Among them: Timmy Smith (1990), Curvin Richards (1991-92), Derrick Lassic (1993), Lincoln Coleman (1993-94), Blair Thomas (1994), Sherman Williams (1995-98), Chris Warren (1998-2000), Robert Chancey (1999), Michael Wiley (2000-2002) and Troy Hambrick (2001-2002).