In 2007 Sean Taylor(Washington Redskins) was murdered and teams put a black circle with a white number 21 in it in tribute to him.
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Jay Cutler was the last player to wear number 6 for the Denver Broncos.
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Laron Laundry, SS of the Washington Redskins
He was number 32 with the Buffalo Bills, and number 2 with the Denver Broncos and Miami Dolphins.
Terrell Davis is the most famous to wear #30 in Denver
Cookie Gilchrist wore #32 with the Buffalo Bills, and #2 with the Denver Broncos and Miami Dolphins.
Not in the NFL regular season. He wore #14 for the Dallas Cowboys, #15 for the New York Giants, and #7 for the Denver Broncos. Did Craig Morton wear the number 5 during the 1977 preseason for the Broncos
According to denverbroncos.com, Tatum Bell wore #26 in the 2006 season.
Bobby Maples played between 1965-1978 for the Houston Oilers, Pittsburgh Steelers, and Denver Broncos. While he was with the Oilers his jersey number was 50. As far as the Steelers and Broncos are concerned I do not know what jersey number he wore.
Because the Patriots are classless...
Because Washington Redskins Safety Sean Taylor was shot and killed and his number was 21. So, every team in the NFL wears that on the back of their helmets.