9:09 AM PT -- Tom Brady is now showing his support for Ahmaud Arbery -- signing a letter from the NFL Players Coalition to Attorney General William Barr, demanding a federal investigation into the shooting.
Along with Brady, several other huge NFL stars have signed -- including Julian Edelman, Warrick Dunn, Cam Jordan, Mark Ingram, Stephon Gilmore, Shaun Alexander and more.
Even NBA coach Steve Kerr signed the letter -- despite the fact he's not in the NFL.
The letter reads ... "The local investigation into this case is marred by conflicts, inaction, [the second assigned prosecutor’s] very deliberate attempt to ensure that Mr. Arbery received no justice, and the current prosecutor’s total failure to act until social media forced his hand."
"The local police force can never be independent, as the elder-McMichael used to work there. And [the second assigned prosecutor’s] statements about the case surely have tainted the local jury pool. If people are to have faith in the justice system, the Department of Justice must act with the FBI leading the investigation."
NFL star Malcolm Jenkinswants justice for murdered Georgia man Ahmaud Arbery -- who would have turned 26 today -- and he's doing his part by going on a jog to show support for Maud's family.
"Happy birthday to Ahmaud Arbery," Jenkins said while out on a 2.23-mile jog ... "Rest in peace, King."
Malcolm's workout is all part of the #RunWithMaud movement -- which is encouraging people to go on a jog to honor Maud -- while his family continues to push for justice.
The 2.23-mile run represents the date Arbery was shot and killed while jogging on Feb. 23.
Two men -- Travis McMichael and his father, Gregory -- have been arrested for the shooting and are facing murder charges.
"Doing my job for you," Jenkins added while encouraging others to follow his lead. "Even though they arrested those two men, we gotta make sure they don't forget his face and that he gets his justice in court."
"Y'all continue to support my brother, uplift his name, show his face, stay diligent. Love y'all."
Ex-NFL wideout Torrey Smith also participated in the run -- saying, "I hate distance running but I hate our justice system and racism more."
Other athletes, including LeBron James, Reggie Bush and more, have voiced their outrageover the incident ... with the Lakers superstar saying, "We’re literally hunted EVERYDAY/EVERYTIME we step foot outside the comfort of our homes!"