Infamous Queensland criminal Garry Dubois, who killed Barbara McCulkin and her two daughters Vicki and Leanne McCulkin, has been found dead in his jail cell overnight.
Queensland Corrective Services confirmed a 74-year-old male prisoner was found dead in his Maryborough Correctional Centre cell about 4.30am on Monday.
Prison officers and paramedics tried to revive him in his single-occupancy cell, but he was declared dead about 5.20am. The death is not being treated as suspicious.
QCS will assist Queensland police in preparing a report for the Coroner.
Dubois and accomplice Vincent O’Dempsey maintained their innocence despite being found guilty.
The pair, in their 70s, were jailed for life for killing the McCulkins in bushland near Warwick on the night of January 16, 1974, after taking them from their Brisbane home.
At their trials, the court was told the men might have been motivated to kill Mrs McCulkin over fears she would try to implicate O’Dempsey in the firebombing of the Whiskey Au Go Go nightclub.
Mrs McCulkin’s estranged husband Billy had connections with O’Dempsey and Dubois, so she might have been able to implicate them, through what her estranged husband may have told her.
Billy McCulkin died in 2011.
O’Dempsey was found guilty of all three McCulkin murders.
Dubois was found guilty of raping and murdering Vicki and Leanne. He was convicted of the lesser charge of manslaughter against Barbara.
Dubois was also due to testify at the new coronial inquest into Brisbane’s horrific Whiskey Au Go Go nightclub firebombing in Fortitude Valley on March 8, 1973, that killed 15 people.
The two-week inquest will begin in Brisbane next Monday.