It's because of Sean Taylor being killed a few weeks ago his number was 21 it is in his memory that they wear that number on their helmets.
Because Sean Taylor was shot and killed a few weeks ago and that is why all the teams have his number 21 on their helmets out of respect for him.
In honor of Washington Redskins Safety Sean Taylor, who was shot and killed this month in a botched robbery.
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The Washington Redskins wear the number 21 on their jersey's because that was the number of a team mate (Sean Taylor) who got shot in his own house by someone who broke in.
That is in honor of Sean Taylor of the Washington Redskins who was killed in a home invasion robbery in November, 2007.
It is in honor of Washington Redskins player Sean Taylor. He died in the 2007 season. He was 24 years old and shot in his Miami home and died at the hospital a few hours later.