During his time playing for LSU, Davey threw for 4,415 yards and 29 touchdowns. As a freshman, Davey was a backup to Herb Tyler and Craig Nall, and saw no playing time. As a sophomore and a junior, Davey shared the QB position with Josh Booty. As a sophomore, Davey led unranked LSU to a 35–10 victory over #17 Arkansas, passing for 224 yards and three touchdowns. As a junior Davey's led unranked LSU to a 38–31 OT victory over #11 Tennessee, passing for 318 yards and 4 touchdowns. As a senior, Davey had the QB position to himself ; and he led LSU to its first Top 10 finish since 1987 and its first SEC Championship since 1988. During the regular season, Davey passed for 3,347 yards, becoming the first QB in LSU history to pass for over 3,000 yards in a season. Davey also beat Peyton Manning's junior-year performance at Tennessee in 1996, which was 9th best in SEC history. With 3,351 yards of total offense on 405 plays, Davey had an average of 8.27 yards of total offense per play, making him the 5th person in SEC history to finish a season with more than 8.0 yards of total offense per play. Davey's best performance during the regular season was at Alabama, when he passed for 528 yards. By passing for 528 yards against Alabama, Davey also became #3 in SEC history for most passing yards in a game. Davey's major victories included unranked LSU's 41–38 victory over #24 Arkansas and #22 LSU's 27–14 victory over #25 Auburn . Against Arkansas, Davey threw for 359 yards and 3 touchdowns. Against Auburn, Davey threw for 245 yards and 1 touchdown. In the SEC Championship game against #2 Tennessee, Davey had 84 yards passing before having to sit the rest of the game out due to injury. Davey capped off his senior season by passing for 444 yards and 3 touchdowns in the Sugar Bowl against #7 Illinois, leading the Tigers to a 47–34 victory. At that time, the only other LSU quarterback who had ever thrown for more than 400 yards in a game was Tommy Hodson in 1989. For his performance, Davey was named Sugar Bowl MVP. For this performance, Davey was enshrined in LSU's hall of fame. As a result of his performance during the 2001 season, Davey was voted to the second team of the All-SEC Team.
Professional career
Davey was rated the fourth best quarterback in the 2002 NFL Draft by NFLDraftScout.com.
Davey was selected by the New England Patriots coming off a record-setting career at LSU, taken in the 4th Round as the 117th pick of the 2002 NFL Draft. While still with the Patriots, Davey showed potential in 2004 playing in NFL Europe. He had a record-setting season, was named "Player of the Year", and won the World Bowl with the Berlin Thunder. Upon returning to the Patriots, he lost his back-up job to Doug Flutie and lost the third-string slot, losing that job to 7th-round pick Matt Cassel. He was subsequently released by the Patriots on August 29, 2005. On September 28, 2005, Davey signed with the Arizona Cardinals as the quarterback behind Kurt Warner, Josh McCown, and John Navarre. On August 28, 2006, he was released.
Davey was signed by the Arena Football League's New York Dragons on October 26, 2006. He played in his first career game on March 4, 2007, replacing an ineffective Leon Murray at the start of the second half. He finished the game having completed 12-of-21 passes for 131 yards, one touchdown and two INTs. Following this game, he was named the Dragons' starting quarterback. Davey was waived in 2008, and signed a contract with the Cleveland Gladiators on April 3 of that year. He was released when the league went bankrupt. After sitting out for five seasons, Davey returned in 2013 as a member of the San Antonio Talons.
