Thomason -- a three-time Pro Bowl player who became the first Philly quarterback to throw for more than 400 yards in a game -- died Tuesday, the family told The New York Times.
Thomason, an Alabama native and graduate of the Virginia Military Institute, spent seven years in the NFL at a time when the forward pass was coming into its own.
He was one of a handful of quarterbacks to top 400 passing yards in a single game when he threw for 437 yards and four touchdowns against the New York Giants Nov. 8, 1953, in Philadelphia.
"The soft, accurate sidearm passes that Thomason whipped through the New York defense had the Giants running around in circles," the Times wrote at the time.
Thomason, who also played for the Los Angeles Rams and Green Bay Packers, retired in 1956 and went on to become a vice president of a heavy equipment company.
Funeral arrangements were still pending Saturday.