Riddle was also a member of the New York Jets, Atlanta Falcons, Baltimore Ravens, Los Angeles Avengers and Calgary Stampeders.
As a junior, he was Culver City's Most Improved Player, an All-Area second team honoree, and led the Bay League with 17 sacks.
He was also named to the 2002 All-Region IV Team by the California Community College Coaches Association/JC Athletic Bureau and tabbed first-team All-Northern Division.
In August 2007, Riddle signed with the Baltimore Ravens, but was waived prior to the beginning of the 2007 regular season,[5] despite a 2 sack performance against the Falcons.
[6] After being waived by the Ravens, Riddle signed with the Los Angeles Avengers of the Arena Football League on a two-year contract.
John Riddle was the first Trojan to score four touchdowns in one game, and in 1924 he and Bryce Taylor of USC were the first African Americans to play against a southern college team.