He was signed on May 8, 2007 as an undrafted rookie free agent from Texas A&M University, but waived on May 15.
In 2009, Warren played for the Spokane Shock professional arena football team.
Justin played football at Robert E. Lee High School in Tyler, Texas.
On September 17, 2013, Warren was traded by the SaberCats to the Pittsburgh Power for future considerations.
This biographical article relating to an American football linebacker born in the 1980s is a stub.