Greg Olsen is mourning a heartbreaking loss … the former NFL star revealed his older brother, Chris, has died after a battle with brain cancer.
The longtime Panthers tight end and current FOX broadcaster shared the devastating news in an emotional Instagram tribute ... explaining Chris lost his fight with glioblastoma -- one of the most aggressive forms of cancer -- after putting up a relentless fight.
"Love you brother," Olsen wrote with a heart emoji.
Olsen made it clear his brother never stopped battling, praising Chris’ toughness and spirit throughout the illness .