Geelong AFL legend Paul Couch has died at the aged 51.
It's believed Couch, who played for Geelong from 1985 to 1997 and won the Brownlow medal in 1989, had a heart attack while cycling with friends.
The AFL said on its Twitter and Facebook accounts that the league "Extends its deepest sympathy to the family, friends and former teammates of 1989 Brownlow Medallist Paul Couch."
AFL Players' Association tweeted: "Very sad to hear about the passing of GeelongCats Paul Couch. Thoughts with his family & friends from all AFLPlayers".
Geelong mayor Darryn Lyons said he was "saddened to hear" of Couch's death, "Thinkin of his family during this time" he tweeted.
"The Brownlow medallist of the 80s always sit together on Brownlow night, won't be the same without good mate Paul Couch RIP no 7," Hawthorn great Robert `Dipper' DiPierdomenico tweeted.
News of Couch's death broke shortly before his old team were about to take on Essendon in the NAB Challenge in Shepparton.
The Geelong Cats confirmed on Twitter that both sides would wear black armbands in honour of Couch during the game.
Essendon Football Club tweeted just before the game "Our thoughts go out to the Couch family and the Geelong footy club."