Agnew played high school football at Catholic Central High School. He was a three-year starter and letterman as a cornerback and wide receiver. He also spent time at running back. He earned first team all-state first team honors his senior year after totaling 1,425 all-purpose yards, thirteen touchdowns and eleven interceptions. Catholic Central had a 12-2 record his senior season in 2005 and finished as the runner-up in the state. Agnew was also a four-year letterman in varsitytrack and field, setting the school record in the 100 and in long jump. He also lettered twice in basketball.
College career
Agnew played in 47 games for the Central Michigan Chippewas from 2007 to 2010, recording 161 tackles, five tackles for loss, one interception, 14 passes defensed, one forced fumble, one fumble recovery and three blocked kicks. He garnered Third Team All-MAC accolades his senior year. He redshirted in 2006. Agnew majored in journalism at Central Michigan.
Professional career
Agnew was rated the 35th best cornerback in the 2011 NFL Draft by NFLDraftScout.com.
Miami Dolphins
Agnew signed with the Miami Dolphins on July 28, 2011, after going undrafted in the 2011 NFL Draft. He was released by the Dolphins on September 3 and signed to the team's practice squad on September 4, 2011. He was released by the Dolphins on September 14 and re-signed to the team's practice squad on October 5, 2011. Agnew was released by the Dolphins on October 25 and signed to the team's practice squad on November 8, 2011. He signed a future contract with the Dolphins on January 30, 2012. He was released by the team on August 31, 2012.
Winnipeg Blue Bombers
Agnew was signed to the Winnipeg Blue Bombers' practice roster on October 10, 2012. He was released by the Blue Bombers on October 14, 2012.
Dallas Cowboys
Agnew was signed to the Dallas Cowboys' practice squad on October 16, 2012. He was promoted to the active roster on November 10, 2012. He played in four games for the Cowboys during the 2012 season. Agnew was released by the Cowboys on December 11, 2012 and signed to the team's practice squad on December 13, 2012. He signed a future contract with the Cowboys on December 31, 2012. He was released by the team on March 4, 2013.
Kansas City Chiefs
Agnew signed with the Kansas City Chiefs on June 6, 2013. He was released by the Chiefs on August 25, 2013.
Toronto Argonauts
Agnew was signed by the Toronto Argonauts on March 11, 2014. He played in sixteen games, starting ten, for the team in 2014. He recorded 31 defensive tackles, 14 special teams tackles and four sacks during the 2014 season. Agnew played in fourteen games for the Argonauts in 2015, accumulating 21 defensive tackles and eight special teams tackles.
Personal life
Agnew held his first Swagnew Game Breakers Football Camp in July 2013.
