Kennedy was also a member of the Denver Broncos, Chicago Bears, Jacksonville Jaguars, Minnesota Vikings, and New York Giants.
Under Coach Tony DeMatteo, Kennedy earned All-American, All-city, All-conference, All-state, and team MVP honors.
He also won a local High School Heisman trophy sponsored by the Downtown Athletic Club.
As a senior in 2002, Kennedy was named a First-team All-American by The Sporting News, and Walter Camp Football Foundation, The NFL Draft Report, and third-team honors from the Associated Press.
In 2006 Kennedy started all 16 games at nose tackle for the Rams for the first time in his career and recorded 39 tackles, one sack, one pass defensed, one forced fumble and two fumble recoveries Kennedy was traded to the Denver Broncos on June 8, 2007, for a 6th round pick in the 2008 NFL draft.
On December 11, 2007, the Chicago Bears signed Kennedy and he played in the final three games of the 2007 season, making three tackles.
[5] The Minnesota Vikings signed Kennedy on December 3, 2008, to help fill the void created when Pro Bowl defensive tackles Pat Williams and Kevin Williams were suspended, but the NFL could not enforce their punishment after local judges stalled the matter indefinitely.
After recording four tackles in the first five weeks of the season, Kennedy was suspended four games for violating the league's policy on performance-enhancing drugs on October 11.
[9] Kennedy was the subject of an article in The New York Times about racist practices at the banking firm JPMorgan Chase.
In 2018, Kennedy attempted to deposit money earned from his football career at a local JPMorgan bank after talks with an employee who made a good impression on him, Ricardo Peters.