The artist, who lived on his own in Wentworth Falls, had been seriously ill for some time.
Suffering a bipolar disorder, he gained some notoriety with his painting of images that included dead cats, bloodied kangaroos, headless women and punk men.
His work can be seen in many galleries around Australia including the National Gallery of Australia, the National Gallery of Victoria, and the Art Gallery of New South Wales.
In 1998, the magazine Australian Art Collector included him in its list of the country's top most collectable artists.
He was one of the finalists in this year's Archibald prize with his portrait Nelson and Koko, featuring the canine star of the film Red Dog and its owner, the producer Nelson Woss.
In 2000, he won the Archibald for his painting of actor David Wenham, prompting the then NSW Art Gallery director Edmund Capon to say: "I do think a lot of the public will look at it and say `I think my kiddy-wink did that the other day'.
"But they would be missing its insight and maturity, knowing how and where to place the marks."
That portrait was his fourth Archibald entry, going one better than his runner-up effort the previous year - a painting of another actor, his cousin Max Cullen.
Last November, Cullen received a 10-month suspended jail sentence for drink-driving and weapons offences.
He had been convicted of driving with mid-range PCA in July 2011 in the NSW Southern Highlands.
Police also found weapons in his car, including a Taser, guns and rifles.
The sentence was suspended on condition he entered into a good behaviour bond and completed a treatment plan put forward by a doctor.
As well as being an entrant in this year's Archibald, Cullen was a subject.
He was shown holding a gun in Paul Ryan's Cullen - Been Feudin, possibly a reference to the subject's run-in with the law over the firearms found in his car in the drink-driving episode.
Cullen had gained early fame in his art-school days by dragging a rotting pig's head around chained to his ankle.
Controversy continued when he teamed up with infamous crime writer Mark "Chopper" Read to produce the children's book Hooky the Cripple: The Grim Tales of a Hunchback who Triumphs.
"I'd never done a kids' book before," Cullen told The Age newspaper in 2002. "But I thought my puerile, infantile style might suit it."
29 Jul 2012