A former children's entertainer, described by a judge as "an evil man through and through", has been sentenced to 25 years in home detention for his relentless sexual abuse of young boys.
As an Adelaide television personality and pantomime director, Ric Marshall had access to a steady stream of vulnerable boys whom he passed on to other perverted men, Justice Kevin Nicholson said in the South Australian Supreme Court on Thursday.
Marshall, 83, was deemed unfit to face trial, but Justice Nicholson found the "objective elements" of the case proven in relation to buggery and other sex offences against four boys in the 1970s.
One victim, visual artist David Jobling, now 52, told AAP "evil" was a fair description of Marshall, who was not present in court.
"It's now the end of a long and arduous chapter, that's for sure," said Mr Jobling, who gave permission for his name to be used.
His abuse began when he was 12, when he had regarded Marshall as "a star" of the television world.
"In those days, you didn't speak back to your elders. You did as you were told," he said.
Marshall, who has Parkinson's disease, dementia, agoraphobia and other conditions, is already the subject of a court mental health supervision order restricting his movements in relation to other sex offences.
In setting a further limiting term of 25 years, Justice Nicholson acknowledged Marshall would die before it expired.
The "relentless depravity and sheer disgusting ugliness" of his behaviour and the extent to which Marshall was prepared to take advantage of vulnerable young boys knew no bounds, the judge said.
With his ready access to young boys, Marshall was like an "elder statesman" in a group of perverted men providing what they must have regarded as "a honeypot", he said.
"Mr Marshall's circle of adult men spent their many, many, many leisurely days obsessed with having sex with young boys," the judge said.
"Mr Marshall, in my view, is an evil man through and through."
His victims had suffered great emotional and psychological damage, the judge said.
He cited one man's statement blaming Marshall for his "38 years of wasted potential".
Mr Jobling told AAP he had tried to deal with the abuse through his art and writing.
He advised other victims to try to "debrief it from your life".