Former Australian rugby international Dan Vickerman has died at the age of just 37.
Vickerman won 63 caps for the Wallabies between 2002 and 2011 and played at three World Cups. His final game for Australia was the 2011 World Cup semi-final defeat to New Zealand.
He also played Super Rugby for the Brumbies and Waratahs along with a season for Northampton in the English Premiership while he was studying at Cambridge University.
The reason for his passing has not been disclosed.
Bill Pulver, chief executive of the ARU, paid tribute to the South African-born second row.
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 played four times against Ireland, including in the 2011 World Cup group stage where he partnered James Horwill in the second row.
Tributes from both teammates and opponents have been paid to Vickerman.
Incredibly saddened waking up to the news of Dan Vickerman. A true gentleman of the game. Thoughts are with his family.
Rest easy Vicks
— Adam Ashley-Cooper (@AdamCoopy) February 19, 2017
Shocked an old team mate Dan Vickerman has passed away..Grateful to have played along side you..Thoughts & prayers are with his wife & 2kids
— Quade Cooper (@QuadeCooper) February 19, 2017
— Nathan Charles (@NathanCharles2) February 19, 2017