Question: Which retired American football player played defense for the 1983 Dallas Cowboys, and briefly left football in 1979 to pursue a career in boxing?

Context paragraphs:
Clint Dolezel: Clint Dolezel (born March 25, 1970) is an American football coach and former professional arena football player in the Arena Football League (AFL).  Dolezel was a quarterback in the AFL, and currently the head coach of the AFL's Philadelphia Soul.  He played college football at East Texas State, and was in the AFL for 13 seasons from 1995 to 2008.  Dolezel first became a head coach in 2010 with the San Angelo Stampede Express of the Indoor Football League (IFL).  After just a single season, Dolezel returned to the AFL as the head coach of the Dallas Vigilantes.  After the Vigilantes franchise suspended operations, Dolezel joined the Philadelphia Soul as their offensive coordinator under head coach Doug Plank.  Plank left the Soul following the 2012 season, and the Soul promoted Dolezel to head coach.  As an AFL player, he was originally signed by the Milwaukee Mustangs.  In his career, he has also played for the Texas Terror/Houston Thunderbears, Grand Rapids Rampage, Las Vegas Gladiators, and the Dallas Desperados.  Dolezel is also a scout for the Dallas Cowboys.

Vashone Adams: Vashone LaRay Adams (born September 12, 1973) is a retired American professional football player who played five seasons in the National Football League with the Cleveland Browns, Baltimore Ravens New Orleans Saints, Kansas City Chiefs and Dallas Cowboys.  Adams first attended Fort Hays State University and Butte Junior College before transferring to Eastern Michigan University.  After college, Adams was signed as an undrafted free agent by the Cleveland Browns.  In his rookie season of 1995, Adams played in 8 games, started 6 of them and recorded 23 tackles.  The following season, the Cleveland Browns moved to Baltimore and became the Baltimore Ravens.  While with the Ravens, Adams recorded the only interception of his career, returning it for 15 yards.  Adams joined the New Orleans Saints for the final season of his career, playing in 5 games, earning 4 starts and recording his only forced fumble.  He would later sign contracts with the Kansas City Chiefs in 1998 and Dallas Cowboys in 1999.

1983 Dallas Cowboys season: The Dallas Cowboys completed the 1983 season with a record of 12 wins and four losses, finishing second in the NFC East.  The team started the season with seven straight victories, including a memorable Monday night win over the Washington Redskins in which the team erased a 20-point halftime deficit and prevailed, 31–30.  The Cowboys were particularly strong on offense, led by quarterback Danny White and running back Tony Dorsett.  The Cowboys scored a team record 479 points and staged a few come-from-behind victories during the season.  However, the defense gave up many points, despite strong play from Randy White, Ed "Too Tall" Jones, and Everson Walls.  In particular, the young secondary was guilty of giving up many big plays throughout the season.

Ed &quot;Too Tall&quot; Jones: Ed Lee "Too Tall" Jones (born February 23, 1951) is a retired American football player who played 15 seasons (1974–1978, 1980–1989) in the National Football League (NFL) for the Dallas Cowboys.  In 1979, he briefly left football to attempt a career in professional boxing.

Calvin Hill: Calvin G. Hill (born January 2, 1947) is a retired American football player.  He played running back in the National Football League for twelve seasons.  Hill played for the NFL Dallas Cowboys, Washington Redskins, and Cleveland Browns.  He also played a season with The Hawaiians of the World Football League in 1975.

Jim Doran: James Robert Doran (August 11, 1927 – June 29, 1994) was a former American football wide receiver in the National Football League (NFL) for the Detroit Lions (1951–1959) and the Dallas Cowboys (1960–1961).  He played college football at Iowa State University.  He was a two-way player, playing both on offense and defense.  He played 94 games as a defensive lineman, usually defensive end, and 115 games as a tight end.  Injuries to teammates forced him to also become a tight end during Detroit's 1953 championship season, and he scored from that position in the 1953 NFL Championship Game.  He was left unprotected in the 1960 NFL Expansion Draft, and Dallas drafted him.  He was the first Pro Bowl player for the Cowboys.

Michael Irvin: Michael Jerome Irvin (born March 5, 1966) is a retired American football player, actor, and sports commentator.  Irvin played college football at the University of Miami, then for the Dallas Cowboys of the National Football League (NFL) for his entire pro athletic career (1988-1999), which ended due to a spinal cord injury.  Irvin was nicknamed "The Playmaker" due to his penchant for making big plays in big games during his college and pro careers.  He is one of three key Cowboys offensive players who helped the team attain three Super Bowl wins: he is known as one of "The Triplets" along with Troy Aikman and Emmitt Smith.  He is also a former broadcaster for ESPN's "Sunday NFL Countdown" and currently an analyst for NFL Network.  In 2007, he was selected to the Pro Football Hall of Fame.

Charley Seabright: Charles (Charley) Seabright (1918–1981) was an American Football player from Wheeling, West Virginia, where he spent the majority of his professional career with the Pittsburgh Steelers.  Seabright played both offense and defense with the Steelers from 1946–1950, including stints as the starting quarterback.  Seabright started every game for the 1947 Steelers in a season that ended in a one-game playoff to eventual champion Philadelphia.  The Pittsburgh Post-Gazette considered Seabright, who wore number 33, a star player during the championship run.  Seabright was one of the last NFL players to play both offense and defense.  In addition, Seabright is recognized as being the last professional football player to be a quarterback in the "single-wing" formation, the precursor to the T-formation regularly used by all NFL teams.  Seabright began his professional football career with the Cleveland Rams in 1941.  However, he left football from 1942-1944 to serve in combat in World War II.

Jason Garrett: Jason Calvin Garrett (born March 28, 1966) is an American football head coach of the Dallas Cowboys of the National Football League (NFL).  Garrett was the offensive coordinator and assistant head coach of the Cowboys before being promoted to interim head coach after the firing of Wade Phillips on November 8, 2010.  He is a former professional American football quarterback in the National Football League for the Dallas Cowboys, New York Giants, Tampa Bay Buccaneers and Miami Dolphins.  He played college football at Princeton University.

Doug Cosbie: Douglas Durant Cosbie (born March 27, 1956) is a former professional American football player in the National Football League who was drafted by the Dallas Cowboys in the third round of the 1979 NFL Draft.  A 6'6", 236-lb.  tight end from Santa Clara University, Cosbie played his entire NFL career for the Cowboys from 1979 to 1988.  He was a three-time Pro Bowl selection from 1983 to 1985.

Supporting paragraphs: 1983 Dallas Cowboys season Ed &quot;Too Tall&quot; Jones
Answer: Ed "Too Tall" Jones