As Bloomberg.com notes:
Bill Parcells retired as coach of the Dallas Cowboys, leaving the National Football League team with one year left on his contract and without a postseason victory.
Parcells’s future had been in question since the Cowboys lost to Seattle in the opening round of the National Football Conference playoffs on Jan. 6. He had a 34-30 mark in four seasons in Dallas, never duplicating the success he had with three previous teams.
Parcells rebuilt the Cowboys’ overall talent level after former head coach Dave Campo’s three back-to-back 5-11 seasons. But as Bloomberg notes, he just couldn’t produce a playoff victory, a massive disappointment from a coach with three Super Bowl appearances, two of which were victories. Parcells’ four years with the Cowboys produced three out of four winning seasons, but during each of those years, his teams tended to fade in December, unlike his best Giants teams, which surged into the last month of the regular season–and beyond.