Answer by taking a quote from the following article:

Charles Lewis Haley (born January 6, 1964) is a former American football linebacker and defensive end who played in the National Football League (NFL) for the San Francisco 49ers (1986-1991, 1998-1999) and the Dallas Cowboys (1992-1996). A versatile defensive player, Haley began his career as a specialty outside linebacker, eventually progressing to pass-rusher and finally full-fledged defensive end. He is the first five-time Super Bowl champion, and is one of only two such players, the other being Tom Brady. He won two Super Bowls with the 49ers (XXIII, XXIV) and three with the Cowboys (XXVII, XXVIII, XXX); he was a starter in all five championship games.

In 1992, Haley was moved to right defensive end in the Dallas Cowboys 4-3 defense, made 39 tackles, 6 sacks, and 42 quarterback pressures (led the team), and helped the team improve from 17th in total defense in 1991 to first. Haley received the UPI NFC Defensive Player of the Year Award and was a consensus All-Pro once again. He is often mentioned as the final piece that helped propel the Cowboys into a Super Bowl contender.  In 1993, Haley made headlines after smashing his helmet through a wall in the locker room following a home loss to the Buffalo Bills, showing his displeasure with the team's inability to sign holdout running back Emmitt Smith, which contributed to an 0-2 start and put the season in jeopardy. The Cowboys relented and reached an agreement with Smith the following week, getting them back on track and making them the first team to win a Super Bowl after starting a season 0-2. He registered 41 tackles, 4 sacks, 2 passes defensed, and 3 forced fumbles, but his recurring back problems began to require a series of surgeries.  In 1994, Haley recovered from off-season surgery (lumbar microdiscectomy) to post 68 tackles, 12.5 sacks, and 52 quarterback pressures. He immediately announced his retirement after losing 28-38 to the 49ers in the NFC Championship game, but decided to return after being offered a new contract.  In 1995, Haley posted 10.5 sacks, 33 quarterback pressures, and 35 tackles in the first 10 games, until suffering a ruptured disk against the Washington Redskins, which derailed his season. He started in Super Bowl XXX six weeks after having back surgery, making one sack, 3 quarterback pressures and 5 tackles. The next year, with the team trying to limit him to 30 plays per game, he appeared in the first three contests, in week 9 and 10, before being deactivated with a back injury. He retired after the season, because of his back injuries and his youngest daughter Brianna having been diagnosed with leukemia.

was he succesful
received the UPI NFC Defensive Player of the Year Award