Davis was ranked among the nation's top 10 tight ends as a high school senior. He played college football at Michigan State, appearing in 43 games with 22 starts. He was an All Big-Ten honorable mention as a senior and totaled 60 receptions for 789 yards and 9 touchdowns over his career. He was also notable for playing on all three units (offense, defense and special teams) during his senior year.
2008 NFL Draft
Regarded as the most physically imposing tight end of the 2008 NFL Draft, concerns over his work ethic and pass production caused him to be projected as a mid-round selection
While he appeared in all 48 games in his first three seasons in the league, he was limited to 5 starts due to the lack of skills and the presence of Greg Olsen on the roster, a 1st round draft pick in 2007.
Following the trade of Olsen to the Carolina Panthers in 2011, Davis became the starting tight end. He had 18 receptions for 206 yards and 5 touchdowns in the 2011 season. The 18 receptions marked the first time in 17 years that a Bears tight end failed to record 20 catches.
The production of Davis was argued to have been negatively affected by the offensive style of coordinator Mike Martz.
In 2012, Davis struggled with drops, and caught only 19 passes. On March 13, 2013, he was released by the Bears.
Davis signed with the New York Giants on April 4, 2014. He was released during final roster cuts.
Davis signed with the Detroit Lions on October 20, 2014. He was waived on November 25, 2014 and re-signed on December 10, 2014
New York Jets
Davis was signed by the New York Jets on March 25, 2015. On March 14, 2016, he was re-signed to a one-year deal. He was waived/injured by the Jets on November 12, 2016 and was placed on injured reserve.