But that may change now the Philippines is considering putting him before a firing squad.
And it is the fate of one victim in particular that has prompted appalled Filipino prosecutors to call for Scully's execution.
Shocking details can be revealed about the five-year-old girl who Scully hung upside down as he raped and tortured her with two accomplices.
Recording on videos which he then sold to paedophiles around the world, Scully also sexually abused a baby, and filmed his torture and rape of young girls as he made them dig their own graves.
Filipino police say Scully also buried a 11-year-old under the floor of a house he was renting after making a film of him raping her and strangling her to death.
Now the Philippines may reinstate the death penalty as the only punishment appropriate for Scully's "heinous crimes".
Capital punishment was outlawed in 1986 at the end of the brutal Marcos regimen, but assisted by widespread poverty, the country has become a hub of a billion-dollar, global child cybersex industry.'
According to a Fairfax report, during a court hearing where he faced the first six of 75 charges, Scully laughed and joked with his co-accused, who include four men, Christian Rouche, Alexander Lao, and Marshall Ruskin and Haniel Caetano de Oliveira.
Chief Philippine prosecutor Jaime Umpa told Fairfax that Scully was the mastermind of an extreme child sex and torture video syndicate based in the southern cities of Surigao, Cagayan de Oro and Malaybalay.
Scully fled to the Philippines from Australia in 2011 after he was charged with fraud.
Scully lured children away from impoverished parents with the promise of food and education or used teenage girl accomplices to kidnap them.
He then drugged the children and made films of him raping and torturing them for an international paedophile ring.
Operating a secret child pornography site on the Dark Web called "No Limits Fun", he sold the videos for up to $10,000 per view.
But of all his despicable acts, his most infamous is the film he made for the Dark Web is Daisy's Destruction.
It is this film which shocked even seasoned child trafficking investigators, a Filipino police chief calling it "the worst we have encountered in our years campaigning against child pornography".
It is believed the victim in the film is a girl called Barbie, who was taken from her family at the age of five by one of Scully's cohorts, Liezyl Magallo.
Margallo and another young girl Carmen Ann Alvarez are also facing charges of child exploitation.
Alvarez is said to have been taken in by Sully as his girlfriend after he met her as a 14-year-old prostitute.
In the film, with Barbie playing "Daisy", Alvarez and Margallo participate in the child's torture and sexual assault.
The little girl screams and cries as she is beaten, raped, tortured and defiled by Scully and his two masked accomplices.
His vile crimes went largely undetected until two of his victims, cousins Queenie and Daisy, aged 9 and 12, escaped.
Offered food and shelter by Alvarez, the girls were taken in, raped and tortured and held captive wearing dog collars and chains for five days,
Alvarez, known as Mistress Scully, made them perform sexual acts upon each other while Scully filmed it.
On camera, they were recorded digging their own graves while being continually raped. Alvarez reportedly let them go out of guilt.
Assisted by the Australian Federal Police and filmed by the Nine's 60 Minutes, Philippine police arrested Scully in February last year.
Alvarez led them to the apartment where the 11-year-old was buried and to another addresses where Scully raped and tortured his child victims.
Scully has pleaded not guilty to the rape and trafficking of two teenage girls and is being held in the Cagayan de Oro City jail.
