Boardercross athlete Pullin was found unresponsive on the sea floor at an artificial reef.
Two-time snowboard cross world champion Alex Pullin has died after an apparent spearfishing accident on Australia's Gold Coast.
The 32-year-old, who finished sixth in the PyeongChang 2018 final and went to two other Olympic Games, was found unconscious without an oxygen mask by a fellow diver.
Officer Chris Tritton of Gold Coast Police said: "He didn't have an oxygen mask, we understand he was free diving and spearfishing out on the reef.
"It appears he was diving alone. There were other divers out there but he was not with a friend."
A spokesperson for the Queensland Ambulance Service said two off-duty nurses happened to be at the beach.
"They performed CPR for 45 minutes between lifeguards, nurses and [ambulances]. The patient was brought into the beach, as we understand, in an unconscious state."
Australian 2010, 2014 and 2018 Winter Olympics chef-de-mission Ian Chesterman said in a statement:
"Chumpy was a champion bloke as well as being a champion athlete. He had great charisma that allowed him to be a natural leader.
"He was always prepared to give his time to build winter sport in this country because he was so passionate about what he did. His enthusiasm was infectious and his impact on Olympic sport can’t be overstated."
Vancouver Olympic champion Lydia Lassila was among those who expressed her shock on social media.
Pullin competed at Vancouver 2010, Sochi 2014, and PyeongChang 2018. He was Australia's flag-bearer at the Opening Ceremony in 2014.