Marcus Udall Bell (born July 19, 1977 in St. Johns, Arizona) is a former professional American football NFL player who played linebacker for three seasons for the Seattle Seahawks. Bell was drafted by the Seahawks in the fourth round of the 2000 NFL Draft (116th). Bell also played one year for the Houston Texans.
Anchored the 1998 team that went 12-1 and was ranked 4th in the nation.
Bell led the Pac-10 his senior year in tackles per game (TPG) with 10.3. 
Bell posted a Pac-10 leading 124 total tackles his senior year in 1999. 
His 139 tackles in 1998 led the nation and he was UA's leader his final two seasons. 
He finished with 405 career tackles, No. 5 on UA's all-time chart.
Bell was a member of the UofA Dick Tomey's fearsome 1998 defense that recorded a school record 46 sacks in 1998. 
Bell was 3-1 vs. ASU
One of 11 semi-finalists for the Butkus Award. The award is presented annually to the best linebacker in college football. This list of 11 semi-finalists was determined by balloting done by the 28-member Butkus Award Selection Committee, who made their selections from the initial Butkus Award Watch List of 66 college linebackers. 
In high school Bell never lost a game. His team, the St. Johns Redskins, went 44-0 and were undefeated for 3 years, winning 3 state championships. 
Bell won a state wrestling title his senior year.
Bell anchored the U of A defense and held the mighty Nebraska running attack to under 100 yards rushing in the 1998 Holiday Bowl, UofA won 23-20.
Bell recorded nation high 21 tackles in one game at Washington as a junior. 
Bell and the UA defense held USC to minus-20 yards rushing in its 31-24 win over the Trojans in 1999, Bell had a team-high nine tackles and an interception in the game. 
Against ASU in 1999, Wildcat linebacker Marcus Bell recovered a fumble giving possession to Arizona, they scored, and won the game.