Extract from the WSJ:

CHICAGO—Hall of Famer Gale Sayers, who made his mark as one of the NFL’s best all-purpose running backs and was later celebrated for his enduring friendship with a Chicago Bears teammate with cancer, has died. He was 77.

Nicknamed “The Kansas Comet” and considered among the best open-field runners the game has ever seen, Mr. Sayers died Wednesday, according to the Pro Football Hall of Fame.

Relatives of Mr. Sayers had said he was diagnosed with dementia. In March 2017, his wife, Ardythe, said she partly blamed his football career.

Mr. Sayers was a blur to NFL defenses, ghosting would-be tacklers or zooming by them like few running backs or kick returners before or since. Yet it was his rock-steady friendship with Brian Piccolo, depicted in the film “Brian’s Song,” that marked him as more than a sports star.

“He was the very essence of a team player—quiet, unassuming and always ready to compliment a teammate for a key block," Hall of Fame President David Baker said. “Gale was an extraordinary man who overcame a great deal of adversity during his NFL career and life.”

He became a stockbroker, sports administrator, businessman and philanthropist for several Chicago youth initiatives after his pro-football career was cut short by serious injuries to both knees.
I was living in Indiana at the time he was playing for the Chicago Bears--who I regarded as my "home" team at the time---he was an exciting runner---and more importantly, a good man. Thank you sir!