He played in thirty-six games at Kentucky, of which he started sixteen. He finished his college career with 2,484 passing yards, thirteen touchdown passes, 845 rushing yards and thirteen rushing touchdowns.
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Professional career
Boyd was rated the 50th best quarterback in the 2005 NFL Draft by NFLDraftScout.com.
Tennessee Titans
Boyd was signed by the Tennessee Titans before the 2005 season, but was released on August 29.
Pittsburgh Steelers
After being signed by the Pittsburgh Steelers, he was allocated to NFL Europe and played for the Cologne Centurions before being cut by the Steelers on September 2. Boyd became NFL Europe’s all-time leading rushing quarterback, amassing 339 yards on the ground to break Jon Kitna’s record by five yards.
Arizona Cardinals
Boyd spent most of the 2006 season on the Arizona Cardinals before being activated for the season finale. He was waived during final cuts on August 31, 2007.
Houston Texans
Boyd was signed to the Houston Texans' practice squad in October 2007. He was re-signed in the 2008 offseason, but waived on August 29.
He was drafted by the California Redwoods on June 18, 2009. He signed with the team on September 2 and scored the first ever UFL touchdown in the second quarter of the game on October 8. Boyd was the only one of the four starting quarterbacks in the UFL's first season to have never played a regular season NFL game.
Indianapolis Colts
Boyd was signed to the Indianapolis Colts' practice squad on December 2, 2009, but was waived on December 9.
Boyd was assigned to the San Antonio Talons of the AFL on April 2, 2014.
Arizona Rattlers
Boyd was assigned to the Arizona Rattlers on April 30, 2015, after Rattlers' starting quarterback, Nick Davila, was placed on injured reserve.
Cleveland Gladiators
Boyd was assigned to the Cleveland Gladiators on January 13, 2017. He started the team's first game of the season, completing 24 of 37 passes for 288 yards, five touchdowns and one interception in a 46–40 loss to the Tampa Bay Storm.
On May 22, 2017, Boyd and Brandon Thompkins were traded to the Baltimore Brigade for claim order positioning and future considerations. He started the team's final game of the regular season, completing 18 of 32 passes for 228 yards and four touchdowns in a 41–35 loss to the Washington Valor. He also started the team's playoff game, completing 21 of 33 passes for 324 yards, seven touchdowns and one interception in a 69–54 loss to the Philadelphia Soul. He rushed for another touchdown. On April 1, 2019, Boyd was again assigned to the Brigade.