Former Olympic champ Grant Hackett arrested

Australian Olympic great Grant Hackett has been released without charge after a disturbance on the Gold Coast on Wednesday.

Craig Hackett said his younger brother's personality had become nearly unrecognizable.

"A man has been arrested following a disturbance at an address in Surfers Avenue at Mermaid Waters, around midday today", Queensland Police said, speaking with Daily Mail Australia.

One of the greats of Australian swimming, Hackett retired after the 2008 Beijing Olympics after winning the 1,500m freestyle at both the 2000 Sydney and 2004 Athens Olympics.

His father Nev admitted his son had "mental health issues". "A deep sense of shame, guilt, embarrassment, of regret, I am so sorry for my actions and the people it has impacted", he said.

"He's been receiving treatment from a doctor", Nev Hackett said.

He came out of six years of troubled retirement to try to make the Rio Games, hoping to become the oldest Australian swimmer to qualify for an Olympics.

He again made headlines after he lost his son at Crown Casino, Melbourne, two years later. That would lead to a five-week stint in rehab.

"If there's anybody out there at all who can help him, you know we're all for it".

The couple later said they were dealing with some "private issues".

He also courted controversy in 2014 when he was dishevelled and claimed he had lost his son at Melbourne's Crown Casino hotel complex, before seeking treatment in the United States for sleeping pill addiction.

Local broadcaster Channel Seven posted video footage of Hackett being driven to a local police station in handcuffs. Westpac dumped him as a brand ambassador after the incident, while a children's charity also cut ties.

BARELY DRESSED IN CASINO: Disoriented and drugged up on sleeping pills, Hackett was photographed in 2014 wandering the foyer of Crown Casino barefoot and barely dressed, searching for his four-year-old son. Upon returning to Australia, he tells media he's ready to get his life back on track.

Last April Hackett was accused of "tweaking" a fellow plane passenger's nipple during a Virgin Australia flight from Adelaide to Melbourne.

PENTHOUSE TRASHING: Hackett's wife Candice Alley called police after he reportedly went on a rampage through their apartment, smashing furniture and photo frames and upending a grand piano.

Police are questioning Hackett, and it is understood he has not yet been charged.

  • Elsie Buchanan