Question: The Ricky Williams trade was instigated by which coach who became a color commentator?

full_context: Document 1: Mike Ditka: Michael Keller Ditka (born Michael Dyczko; October 18, 1939) is a former American football player, coach, and television commentator. A member of both the College Football (1986) and Pro Football Hall of Fame (1988), he was the 1961 UPI NFL Rookie of Year, a five-time Pro Bowl selection and five-time All-Pro tight end with the Chicago Bears, Philadelphia Eagles, and Dallas Cowboys of the National Football League (NFL).
Document 2: Quarterback Attack with Mike Ditka: Quarterback Attack with Mike Ditka is a 1995 football video game published by Digital Pictures for the Sega Saturn, 3DO and MS-DOS. It features Mike Ditka as head coach of the player's team. Unlike in most football video games, the player does not control an entire team. Instead, "Quarterback Attack" attempts to simulate the experience of being a professional quarterback, with the other players rendered in full motion video (FMV). This break with convention divided critical response to the game.
Document 3: Walter Payton: Walter Jerry Payton (July 25, 1954 – November 1, 1999) was an American football running back who played for the Chicago Bears of the National Football League (NFL) for thirteen seasons. Payton was known around the NFL as "Sweetness". A nine-time Pro Bowl selectee, Payton is remembered as a prolific rusher, once holding records for career rushing yards, touchdowns, carries, yards from scrimmage, all-purpose yards, and many other categories. He was also versatile, and retired with the most receptions by a non-receiver, and had eight career touchdown passes. He was elected into the Pro Football Hall of Fame in 1993 and the College Football Hall of Fame in 1996. Hall of Fame NFL player and coach Mike Ditka described Payton as the greatest football player he had ever seen—but even greater as a human being.
Document 4: 2006 NFL Draft: The 2006 National Football League Draft, the 71st in league history, took place in New York City, New York, at Radio City Music Hall on April 29 and April 30, 2006. For the 27th consecutive year, the draft was telecast on ESPN and ESPN2, with additional coverage offered by ESPNU and, for the first time, by the NFL Network. Having signed a contract with the Houston Texans on the evening before the draft, Mario Williams, a defensive end from North Carolina State, became the draft’s first pick. The selection surprised many commentators, who predicted that the Texans would draft Southern California running back Reggie Bush or Texas quarterback Vince Young. Ohio State produced the most first round selections (five), while Southern California produced the most overall selections (eleven). Twenty-seven compensatory and supplemental compensatory selections were distributed amongst seventeen teams; Tampa Bay, Baltimore, and Tennessee each held three compensatory picks. The league also held a supplemental draft after the regular draft and before the regular season. The 255 players chosen in the draft were composed of:
Document 5: Dick Butkus: Richard Marvin Butkus (born December 9, 1942) is a former American football player, sports commentator, and actor. He played professional football as a linebacker for the Chicago Bears of the National Football League (NFL) from 1965 to 1972. Through nine NFL seasons, he was invited to eight Pro Bowls, named a first-team All-Pro six times, and was twice recognized by his peers as the NFL's Defensive Player of the Year. Renowned as a fierce, violent tackler and for the relentless effort with which he played, Butkus is widely regarded as one of the greatest and most intimidating linebackers in pro football history.
Document 6: Ricky Williams trade: The Ricky Williams trade was a trade between the New Orleans Saints and Washington Redskins of the National Football League (NFL), which occurred prior to the 1999 NFL draft. Mike Ditka of the Saints wanted to move up in the draft order to ensure that he would be able to select Ricky Williams from the University of Texas at Austin. To do so, he traded every pick he had in the draft for the fifth overall selection, which he used to select Williams.
Document 7: Trent Williams: Trent Williams (born July 19, 1988) is an American football offensive tackle for the Washington Redskins of the National Football League (NFL). He played college football at Oklahoma, and was recognized as an All-American. He was considered one of the best tackle prospects available for the 2010 NFL Draft, and was drafted fourth overall by the Redskins.
Document 8: Ricky Williams: Errick Lynne "Ricky" Williams Jr. (born May 21, 1977) is a retired American football running back who played twelve seasons in the National Football League (NFL) and one season in the Canadian Football League (CFL). He played college football for the University of Texas, where he was a two-time All-American and won the Heisman Trophy. Williams was drafted by the New Orleans Saints fifth overall in the 1999 NFL Draft and spent three seasons with the team before he was traded to the Miami Dolphins in 2002. He played for the Dolphins for two seasons, and retired for the first time from football in 2004. Due to his suspension from the NFL in 2006, he played for the Toronto Argonauts that year. Williams re-joined the Dolphins in 2007 and played with them until 2010, and spent the 2011 season with the Baltimore Ravens. He was formerly an assistant football coach at the University of the Incarnate Word and is currently a football analyst for ESPN's Longhorn Network. In 2015, Williams was inducted into the College Football Hall of Fame.
Document 9: Jim Mandich: James Michael Mandich (July 30, 1948 – April 26, 2011), also known as "Mad Dog", was an American football player. Mandich played college football for the University of Michigan from 1967 to 1969 and was recognized as a consensus first-team tight end on the 1969 College Football All-America Team. A second-round pick in the 1970 NFL Draft, he played in the National Football League (NFL) as a tight end for the Miami Dolphins (1970-1977) and Pittsburgh Steelers (1978). After his playing career ended, he worked as the color commentator for the Miami Dolphins and also hosted a sports talk show on local AM radio in Miami.
Document 10: Chuck Howley: Charles Louis "Chuck" Howley (born June 28, 1936) is a former American football linebacker who played in the National Football League (NFL) for 15 seasons, primarily with the Dallas Cowboys. Howley was a member of the Chicago Bears in his first two seasons and spent the remainder of his career with the Cowboys. He was named the MVP of Super Bowl V and is the only player on a losing team to receive the award.
Document 11: Ricky Watters: Richard James Watters (born April 7, 1969) is a former American football running back who played for the San Francisco 49ers, Philadelphia Eagles, and the Seattle Seahawks of the National Football League. Watters played college football at the University of Notre Dame where he played wide receiver on the school's 1988 national champion team. He also won a Super Bowl as a member of the 1994 San Francisco 49ers. Watters was known throughout his playing career for his outstanding receiving skills and his unique high-step running style, which earned him the nickname Ricky "Running" Watters, from ESPN sportcaster Chris Berman.
Document 12: Eric Dickerson: Eric Demetric Dickerson (born September 2, 1960) is a former college and professional American football player who was a running back in the National Football League (NFL) for eleven seasons during the 1980s and 1990s. Dickerson played college football for the SMU Mustangs of Southern Methodist University and was recognized as an All-American. He was selected in the first round of the 1983 NFL Draft and played professionally for the Los Angeles Rams, Indianapolis Colts, Los Angeles Raiders, and Atlanta Falcons of the NFL. During his NFL career, he rushed for over 13,000 yards. He holds the NFL's single-season rushing record with 2,105 yards, set in 1984. Dickerson was inducted into the Pro Football Hall of Fame in 1999.
Document 13: Ricky Powers: Richard "Ricky" Powers (born November 30, 1970) is a former running back in the National Football League (NFL) for the Cleveland Browns and a former University of Michigan Wolverines football co-captain. In the NFL, he had a brief career with the Browns during their final season before they relocated to become the Baltimore Ravens after starring for the Wolverines. His career ended due to being lost in the shuffle when the Browns moved to Baltimore and changed coaching staffs. In college, he set the Michigan football freshman rushing record that stood fourteen seasons and as a sophomore was the leading rusher for the team during Desmond Howard's Heisman Trophy-winning season. At Michigan, he was a member of three consecutive Big Ten Conference football champions. In high school, he was the Parade All-American star running back of the two-time Ohio High School Athletic Association (OHSAA) football championship team at Buchtel High School, where he has returned to coach baseball and football.
Document 14: Mike Singletary: Michael Singletary (born October 9, 1958) is an American football coach and former professional football player. After playing college football for Baylor University, Singletary was drafted by the Chicago Bears in the 2nd round of the 1981 NFL Draft and was known as "The Heart of the Defense" for the Chicago Bears' Monsters of the Midway in the mid-1980s. He was inducted into the Pro Football Hall of Fame in 1998. Singletary later pursued a career as a coach, first as a linebackers coach for the Baltimore Ravens, then as the linebackers coach for the San Francisco 49ers. In 2008, the 49ers promoted Singletary to the head coaching position after previous head coach Mike Nolan was fired during the season, and he remained in that position until he was fired after the 49ers were eliminated from the playoffs with one game remaining in the 2010 season.
Document 15: 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.
ground_truth: Michael Keller Ditka