The legendary outback painter lost his battle with motor neurone disease in the early hours of Tuesday morning.
His condition worsened last week and on Friday his family decided to end his medication.
Pro Hart was almost as famous for his spaghetti-throwing carpet cleaning ads as his distinctive art.
But whether it was his sweeping landscapes or 30 seconds of television fame he became a household name in Australia and one of the most popular contemporary artists of our time.
Once a prolific painter he hadn't been able to lift a brush since December last year when he was diagnosed with the debilitating disease that causes muscle wastage.
Born Kevin Charles Hart in Broken Hill on May 30 1928, Pro Hart’s early years were spent on the family's sheep property 'Larloona Station' near Menindee.
A self taught artist Pro Hart’s preoccupation with painting and the Australian outback started early and the young miner worked a double life toiling during the day and turning to his canvases at night.
Using mainly oils and acrylics Pro Hart layered glazed scumbled and scratched or as he put it, chucked the paint on.
He also created sculptures with welded steel bronze and ceramics.
Two years after marrying Raylee June Tonkin in 1960 Pro Hart was discovered by a gallery director in Adelaide and his first exhibition was a sellout.
He exhibited all over the world, including London, New York, Paris and Tokyo and also illustrated several books.
Earlier this month much of his private collection was sold with prices ranging from seven to 45 thousand dollars.
The works some of them 30-years-old capture a history of Australia its people and their lifestyle.
Pro Hart is survived by his wife Raylee and children John, Kym, Marie, Julie and David.