FILE - Dallas Cowboys wide receiver Michael Irvin smiles as he holds the Vince Lombardi Trophy the Cowboys won in NFL football's Super Bowl XXVII against the Buffalo Bills in Pasadena, Calif., Jan. 31, 1993. (AP Photo/Rick Bowmer, File)

FILE - Dallas Cowboys head coach Jimmy Johnson, right, celebrates with owner Jerry Jones who holds up the Vince Lombardi Trophy after their win over the Buffalo Bills in NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. (AP Photo/Rick Bowmer, File)

FILE - Dallas Cowboys quarterback Troy Aikman carries the ball during the first quarter of NFL football's Super Bowl XXVII against the Buffalo Bills in Pasadena, Calif., Jan. 31, 1993. (AP Photo/Doug Mills, File)

FILE - Dallas Cowboys quarterback Troy Aikman (8) prepares to release a fourth-quarter pass against the Buffalo Bulls during NFL football's Super Bowl XXVII, Jan. 31, 1993, in Pasadena, Calif. (AP Photo/ Susan Ragan, File)

FILE - Dallas Cowboys running back Emmitt Smith (22) picks up yardage under Buffalo Bills linebacker Cornelius Bennett during the first quarter of NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. (AP Photo/Rick Bowmer, File)

FILE - Buffalo Bills quarterback Jim Kelly (12) sits on the field after fumbling the ball in the first quarter and giving up a touchdown to Dallas Cowboys defender Jimmie Jones during NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. Cowboys defender Charles Haley forced the fumble that Jones took in for the score. (AP Photo/Eric Risberg, File)

Dallas Cowboys Michael Irvin (88) celebrates as teammate Alvin Harper (80) comes in to offer congratulations after a second-quarter touchdown reception against the Buffalo Bills in NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. (AP Photo/Douglas C. Pizac, File)

FILE - Buffalo Bills quarterback Jim Kelly, right, grabs his right knee after being tackled by Dallas Cowboys defender Ken Norton (51) during the second quarter of NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. Kelly was knocked out of the game on the play. (AP Photo/Rick Bowmer, File)

FILE - Dallas Cowboys defender Leon Lett (78) has the football stripped from his hand near the goal line by Buffalo Bills' Don Beebe during the fourth quarter of NFL football's Super Bowl XXVII in Pasadena, Calif., Jan. 31, 1993. Beebe prevented a touchdown after Lett received a recovered fumble and began celebrating yards before he crossed the goal line. (AP Photo/Chris O'Meara, File)