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The 74-year-old rapist and killer was discovered in his Maryborough Correctional Centre cell alone at 4.30am today.
Paramedics and prison officers tried to revive Dubois but he was pronounced dead 50 minutes later, at 5.20am.
Barbara McCulkin and her daughters Vicki and Leanne.(Supplied)
McCULKIN MURDERS:
In 2016, Dubois was sentenced to life in prison for the killings of the McCulkin family in 1974.
Dubois was found guilty of raping and murdering 11-year-old Leanne and 13-year-old Vicki, and guilty of the manslaughter of their mother Barbara McCulkin, 34.
Dubois and O Dempsey allegedly took the McCulkins from their Highgate Hill home on or about January 16, 1974.
The death of convicted killer Garry Dubois, who was expected to appear at the new inquest into the Whiskey Au Go Go nightclub fire bombing where 15 people died, will not delay the inquest start on Monday.