Missouri attended Theodore Roosevelt High School. As a senior, he helped his team win the state championship in football, receiving All-state, All-district, All-city and Defensive Player of the year honors. He also practiced track, where he was a two-time Academic All-district selection as a shot putter.
College career
Missouri accepted a football scholarship from Northwestern University. As a true freshman, he suffered a fractured fifth metatarsal in his right foot, that forced him to redshirt. As a redshirt freshman, he appeared in 7 games, making 4 tackles and one fumble recovery. As a sophomore, he was named a starter at left defensive end, posting 34 tackles, 7 tackles for loss and 3 sacks. As a junior, he recorded 52 tackles, 20 tackles for loss and 5 sacks. As a senior, he registered 51 tackles, 16 tackles for loss, 9 sacks and 5 forced fumbles.
On October 29, 2001, he was signed by the Dallas Cowboys from the Ravens practice squad. He was deactivated for the seventh and eighth game. He was a backup at left defensive end against the Philadelphia Eagles. He was deactivated for games tenth to thirteenth. He saw action against the Arizona Cardinals, before being deactivated for the last 2 games. In 2002, he was allocated to the Berlin Thunder of the NFLEurope League. He collected 27 tackles, 5.5 sacks, 4 passes defensed and 3 forced fumbles, helping the team win World Bowl X. He was released from the Cowboys on August 19.
San Francisco 49ers
On March 31, 2003, he was signed as a free agent by the San Francisco 49ers. On May 19, it was reported in the media that he didn't show up for a minicamp. The next day, it was reported that Missouri was quitting football.
Colorado Crush (AFL)
In 2003, he was signed by the Colorado Crush of the Arena Football League. He played in 7 games, making 8.5 total tackles, one sack, and 3 passes defensed. On September 17, he was traded to the Philadelphia Soul in exchange for a first round draft choice in the 2004 Expansion Draft.
Philadelphia Soul (AFL)
In his 4 seasons with the Philadelphia Soul of the Arena Football League, he registered 72.5 total tackles, 18.5 sacks, 15 passes defensed, 15 forced fumbles, 2 blocked kicks, 6 receptions for 38 yards and 2 touchdowns. He was released on November 12, 2007.
Utah Blaze (AFL)
On November 20, 2007, he was signed by the Utah Blaze of the Arena Football League.
Personal life
Missouri was featured in the first season of HBO's Hard Knocks series as a member of the Baltimore Ravens. He is currently an assistant high school football coach at McCollum High School in San Antonio, Texas and working on his alternative certification to become a special education teacher.
