In his 32-year career, Reeves became a Wild West celebrity, with folk songs springing up about the marshal with almost mythical strength.
He died in 1910, at the impressive age of 71, just as segregation laws were starting to take effect in his home state.
Last year, a seven-meter bronze statue of Reeves, in all his gun-slinging glory atop a horse, was unveiled in Fort Smith, Arkansas.
"He's one of America's most important heroes and it's sad his story isn't known more than it is," said Burton. "But unfortunately, the majority of black history has been buried.
"Even today, nobody knows where Reeves is buried -- I like to tell people he's still in disguise."