Brandon Marshall, linebacker with the Denver Broncos, posted the letter Friday on Instagram. 

Denver Broncos linebacker Brandon Marshall announces that he has ended his National Anthem protest. He cites positive change toward ending police violence.

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The World Anti-Doping Association (WADA) revealed Russian hackers released the confidential medical records of certain U.S. Olympic athletes, including Biles.

Kaepernick is not the first athlete to sit out the National Anthem or speak out on racial injustice, but his protest stands out because of his prominence and his willingness to take a risk.