Question: What former American football coach, known as The Big Tuna, was hired by the Dallas Cowboys in 2003?

Context paragraphs:
Butch Davis: Paul Hilton "Butch" Davis, Jr. (born November 17, 1951) is an American football coach.  He is the head football coach at Florida International University.  After graduating from the University of Arkansas, he became an assistant college football coach at Oklahoma State University and the University of Miami before becoming the defensive coordinator for the Dallas Cowboys of the National Football League (NFL).  He was head coach of the University of Miami's Hurricanes football team from 1995 to 2000 and the NFL's Cleveland Browns from 2001 to 2004.  Davis served as the head coach of the University of North Carolina at Chapel Hill (UNC) Tar Heels football team from 2007 until the summer of 2011, when a series of National Collegiate Athletic Association (NCAA) investigations resulted in his dismissal.  He was hired by the NFL's Tampa Bay Buccaneers as an advisor in February 2012.

2003 Dallas Cowboys season: The 2003 Dallas Cowboys season was the 44th season for the team in the National Football League.  Coming off three consecutive 5–11 seasons, Dallas hired former New York Giants, New York Jets, and New England Patriots coach Bill Parcells.  In a scheduling coincidence, the Cowboys faced all three said teams in the 2003 regular season.

Ken Gray (American football): Kenneth Don Gray (born March 10, 1936 in San Saba, Texas) was an offensive guard who played 13 seasons in the National Football League for the Chicago Cardinals/St. Louis Cardinals and the Houston Oilers.  Gray attended and played football for four seasons at Howard Payne University.  His first NFL contract, in 1958, paid him $6,000.00.  In those days the league was composed of 12 teams, split into two divisions.  After retiring as a player, earning six All-Pro awards, he served for three years as head coach at his high school alma mater, Llano High and offensive line coach for the 1977 AFC Champion Denver Bronco team that earned its way to Super Bowl XII, to play against the Dallas Cowboys.  In 2016, he was inducted into the Texas Sports Hall of Fame along with former University of Texas head football coach Fred Akers, former Dallas Cowboys offensive lineman Larry Allen and former Major League Baseball pitcher Andy Pettitte.  He earned a spot on the St. Louis Cardinals’ All-Time Team and the NFL All-1960s Team.  A Christian, Gray first and foremost considers himself blessed with his lovely and gracious wife, Shirley, who has stood by him through all the years of risking injury in high school, college and league play, and the unique challenges of his coaching years to the present.  They met and were wed back in their high school days at Llano High School.  Their union produced two fine sons, Shane and Boyd and a grand child, Garret.

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.

Wade Wilson (American football): Charles Wade Wilson (born February 1, 1959) is an American football coach and former quarterback who played for the Minnesota Vikings, Atlanta Falcons, New Orleans Saints, Dallas Cowboys and the Oakland Raiders in a seventeen-year career from 1981 to 1998 in the National Football League (NFL).  He is currently the quarterbacks coach for the Dallas Cowboys, a position he has held since 2007.  He played college football for Texas A&M University-Commerce (formerly East Texas State), where he was an NAIA All-American Quarterback and led the Lions to the NAIA national semifinals during the 1980 season.

Bill Parcells: Duane Charles "Bill" Parcells (born August 22, 1941), also known as The Big Tuna, is a former American football coach, best known as a head coach in the National Football League (NFL) for 19 seasons.  He rose to prominence as the head coach of the New York Giants, whom he led to two Super Bowl titles.  Parcells later served as the head coach of the New England Patriots, New York Jets, and Dallas Cowboys.  Throughout his career, he coached teams that were in a period of decline and turned them into postseason contenders.  He is the only coach in NFL history to lead four different teams to the playoffs and three different teams to a conference championship game.

Barry Switzer: Barry Layne Switzer (born October 5, 1937) is a former American football player and coach.  He served for 16 years as head football coach at the University of Oklahoma and four years as head coach for the Dallas Cowboys of the National Football League (NFL).  He helped the Cowboys win Super Bowl XXX against the Pittsburgh Steelers.  He has one of the highest winning percentages of any college football coach in history, and is one of only three head coaches to win both a college football national championship and a Super Bowl, the others being Jimmy Johnson and Pete Carroll.

Marc Colombo: Marc Edward Colombo (born October 8, 1978) is a former American football offensive tackle who played for ten seasons in the National Football League (NFL) for the Chicago Bears, Dallas Cowboys and Miami Dolphins.  He played college football at Boston College.  He is the current Assistant Offensive Line Coach for the Dallas Cowboys.

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.

Tashard Choice: Tashard J. Choice (born November 20, 1984) is a former American football running back in the National Football League for the Dallas Cowboys, Washington Redskins, Buffalo Bills and the Indianapolis Colts.  He played college football at Georgia Tech.  Choice is currently a coach for the Dallas Cowboys.

Supporting paragraphs: 2003 Dallas Cowboys season Bill Parcells
Answer: Bill Parcells