Who am I?

I played college football for S.M.U. and caught 5 passes as a sophomore and 11 as a junior.

I was chosen in the 20th round of the NFL draft.

I played in the NFL for 13 seasons as a wide receiver and made 631 receptions for 9,275 yards, 68 touchdowns but fumbled only once in my entire career.

I hold the record for the most receptions in an NFL title game.

I have a bust in Canton.

I was head coach of an NFL team that went to the Super Bowl and lost.

Who am I?