Colbert also played for the Denver Broncos, Seattle Seahawks, Detroit Lions, Florida Tuskers, Sacramento Mountain Lions, and Kansas City Chiefs.
Colbert attended Hueneme High School in Oxnard, California, and was a letterman in football and track. He also lettered in basketball as a sophomore. Colbert also attended Sunkist Elementary and E.O. Green Junior High School. He played football as a youth for the Port Hueneme Rhinos.
He attended University of Southern California, where he was a star wide receiver. In his final year at USC (2003), Colbert made an unbelievable catch while he was interfered by two defenders in the Rose Bowl against University of Michigan, broke away and walked into the end zone for a touchdown. Colbert's 149 yards in the Rose Bowl were a career-high. The effort helped USC capture the AP National Championship. Colbert caught at least one pass in his final 36 games, and left USC as the school's all-time leader in pass receptions, passing Kareem Kelly with 207. He earned All-Pac-10 second-team honors his senior year and finished second on the team with 69 receptions for 1,013 yards and nine touchdowns.
Colbert was the Carolina Panthers' second round pick in the 2004 NFL Draft. With the Panthers, he stepped into the 2nd receiver spot when Steve Smith was injured. He filled in nicely, with 47 catches for 754 yards and 5 touchdowns. On Oct 10, Colbert recorded 4 receptions for 115 yards and a touchdown against the Denver Broncos, setting a franchise rookie record with 28.7 yards/reception.
With high expectations for Colbert in the 2005 season, he struggled catching 25 passes for 282 yards and just 2 touchdowns. In 2006, Colbert was often inactive late in the season, and following a mediocre 2007 campaign, was placed on injured reserve.
On March 1, 2008, he signed with the Denver Broncos to a three-year, $7.2 million contract, including a $2.5 million signing bonus.
On September 16, 2008, Colbert was acquired from the Denver Broncos by the Seattle Seahawks for a conditional fifth-round pick in the 2009 NFL Draft. Colbert was released by the Seahawks on November 11.
Colbert was signed by the Detroit Lions on December 1, 2008 after wide receiver Mike Furrey was placed on injured reserve. On May 7, 2009, he was resigned to the Lions for the 2009 season. On September 5, 2009, he was cut from the team.
On June 12, 2011, Colbert signed with the Sacramento Mountain Lions of the United Football League.
On August 10, 2011, Colbert signed with the Kansas City Chiefs of the National Football League. He was waived on November 23.
In 2010, Colbert was hired as the assistant tight ends coach at USC, a position he held for only one season.
In 2013, Colbert was the assistant wide receivers coach at Georgia State.
Colbert served as the offensive analyst at Alabama during their 2014 and 2015 seasons.
In 2016, Colbert returned to the USC coaching staff as an offensive analyst.