NFL star Tyrann Mathieu has paid for the funeral costs of a 9-year-old boy who was killed in a horrific shooting in New Orleans, TMZ Sports has learned.

Devante Bryant was shot in the head on July 13th in a mysterious attack on a bunch of kids. Two other teenagers -- 13 and 16 -- were also shot, but they survived.

Cops are investigating but so far, they don't seem to have any idea about why someone would commit this horrible act.

When Tyrann -- who's from Louisiana -- found out about the killing, he wanted to help the family and felt paying for the funeral costs would allow them to focus on grieving for their son.

"Young black children should not be dying from gun violence," the Kansas City Chiefs superstar tells TMZ Sports.

"Devante didn't even have a chance to live his life before it was tragically taken away from him."

"My goal is to help stop the violence and help my community to show and empower children from my community that there is another way, one child at a time."

"I wanted to help the Bryant family because I am from the 7th Ward and I felt that pain. I have a 7-year-old son that lives in New Orleans and I couldn't imagine something happening to him at that age. He is only 2 years younger than Devante."

"My heart goes out to the Bryant and Howard Family."

If you have any information about the shooting -- please reach out to the New Orleans PD.

RIP.

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