"I'm done," Mason told Scout.com. "I won't be playing football. I leave it healthy and able to run and walk and not take a half-hour or 45 minutes to get out of bed. Me leaving now, even though it didn't happen the way I wanted it to happen, I had a good run."
Mason leaves the league after 15 seasons spread across four teams. Drafted by the Tennessee Oilers in 1997, Mason quickly became a fixture in Tennessee's offense. In eight seasons with the Oilers/Titans, Mason hauled in 453 receptions, fifth in franchise history. His steady hands also led the Titans to an appearance in Super Bowl XXXIV.
In 2005, Mason came to Baltimore, where he became a reliable target in the Ravens' offense for six years. During that time he caught 471 passes and became a veteran presence on an otherwise young offense.
This past season, however, was a bumpy end to Mason's career. He was let go by the Ravens due to salary cap issues, picked up then traded by the New York Jets, before finishing his career with the Texans. Mason played in only seven games in Houston, catching six passes and zero touchdowns.
The 37-year-old finishes his career with 943 receptions, good for 11th in league history.