Cape Town - SA-born former Wallaby star, Dan Vickerman, has died at the age of 37.
Vickerman, who featured in 63 Tests for Australia between 2002 and 2011 passed away on Saturday evening according to the Daily Telegraph.
The cause of his death is unknown but there are no suspicious circumstances surrounding his passing.
It is understood many of Vickerman's former team-mates are devastated by the news with the Wallabies posting "Rest in Peace, Dan Vickerman. 63 Tests, three Rugby World Cups, infinite respect." on Instagram.
Australian Rugby Union (ARU) chief executive Bill Pulver expressed his shock at Vickerman's passing in a statement released on Sunday.
"The rugby world is in shock today after news of the tragic passing of Dan Vickerman. Dan was an uncompromising competitor who forged a wonderful international rugby career despite a number of injury setbacks along the way.
"He was an enforcer on the field and a much-loved character off the field. He cared deeply about the game and the players, helping players transition into life after rugby in his role with RUPA following his retirement.
"Our thoughts and prayers are with Dan's family at this extremely difficult time."
Vickerman, who played Super Rugby for the Brumbies and the Waratahs, is survived by his wife and two young children.