This is the second known racial incident aimed at an NFL player this week
Denver Broncos linebacker Brandon Marshall took to Instagram Friday to share a hate-filled letter he received two weeks ago that called him vile names and threatened his life.
"The hatred by some against people of color is one of the reasons we are where we're at in the world today and they wonder why we feel the way we do and take the stances that we take," Marshall wrote on Instagram along with a photo of the letter, adding that he received the letter at work.
Marshall joined 49ers quarterback Colin Kaepernick's protest movement of kneeling during the national anthem.
The letter calls Marshall "worthless" and suggests he "go back to Africa" before delivering a clear threat: "Your time is coming, watch out n-----!!"
The letter was sent with a return address of Mrs. Jackson's sixth-grade class at Martin Luther King Middle School, and "We love you, Mr. Marshall" was written on the envelope, ESPN reports. Marshall believes it was a cover to make sure he received the letter.
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The NFL is investigating the letter after it was turned over to the league by Broncos team officials, Denver’s KUSA reported.
The letter is the second racial incident aimed at an NFL player this week. New York Giants fullback Nikita Whitlock reported a break-in on Tuesday during which burglars drew a swastika and "KKK," as well as the word "Trump," on walls inside his home, the Huffington Post reported.