Cardinals: Quarterback Carson Palmer retires from NFL

PHOENIX (KSAZ) - Arizona Cardinals Quarterback Carson Palmer is retiring from the NFL, according to Cardinals Officials.

On the team's verified Twitter page, Cardinals officials posted an open letter from Carson Palmer, who said he "just knows" that it's time for him to walk away.

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In the letter, Palmer said he "he just know" that it was time to walk away, having heard some of his teammates saying the same thing over the years. Palmer also said, in the letter, that he and his family are "beyond grateful" for everything football has given them, as well as the love and support they felt from fans.

According to Palmer's profile on NFL.com, Palmer began his pro football career with the Cincinnati Bengals in 2003. Palmer played for the Oakland Raiders from 2011 to 2012, and has been with the Cardinals since 2013.

According to NFL.com's page on the 2003 Draft, Palmer was a first-round draft pick for the Cincinnati Bengals.

This is a developing sports news story. Stay with FOX 10 Phoenix for further developments.