Porters Lawyers' Jason Parkinson, who has already recovered millions of dollars in compensation for Kostka Chute's Marist College Canberra victims, was recently contacted by a former Marist Brothers Penshurst student who says he was abused weekly by Chute in 1970.

''He was in year 6 in 1970 and said Kostka Chute abused him on a weekly basis over the course of the year,'' Mr Parkinson said.

''Chute was able to do this because, shortly after his arrival, he had a small, windowless office built, using as part of its framework two of the thick pillars supporting the wall in the classroom.''

The boy was too frightened to tell anyone and nothing came out until 1972.

''Robert 'Dolly' Dunn, who was also teaching at Marist Brothers Penshurst at the time, approached him and said, 'I understand Brother Kostka has been abusing you', or words to that effect,'' Mr Parkinson said.

''Dunn, who was a lay teacher and not a brother, took this fellow to the senior headmaster, where the matter was reported and the boy told his story.''

All of this happened in about October, and the following year (1973), Chute was transferred to Marcellin College in Coogee as a primary teacher.

The student who had been abused by Chute was also moved to another Marist Brothers school.

''Now the only way, it seems to me, that Dunn could have known Kostka was abusing this lad was if Kostka had told him,'' Mr Parkinson said. ''I would surmise that Dunn was trying to draw attention away from his own offending by 'shopping' a mate.''

Because Chute was a brother, the consequences of his being found out were likely to have been less than they would have been for Dunn, he said.

''Brothers were transferred, while Dunn would probably have been dismissed.''

Chute was moved to Penshurst as the principal of the junior school in mid-1969. That promotion came after he admitted abusing a boy while he was the principal of St Joseph’s in Lismore, an action that also resulted in him receiving a ''canonical warning'' on July 19 that year.

The Penshurst complaint was drawn to the attention of the then provincial of the Marist Brothers, Brother Charles Howard, who went on to serve as the Superior General of the International Congregation of the Marist Brothers from 1985 to 1993.

Dunn died in Long Bay jail on July 11, 2009. He was 68 years old and eight years into a 20-year term for 24 counts of child sexual abuse and three counts of supplying cannabis.

All of the sexual offences dated from 1985 to 1995. Dunn had previously avoided prosecution as a drug dealer, serial sex offender and the head of a notorious sex abuse ring through payments, claimed to have totalled more than $40,000, to corrupt Kings Cross police.

His activities formed the basis of one of the case studies for the Justice James Wood royal commission into NSW police corruption in the mid-1990s.

Dunn’s criminal activities and lack of remorse were first exposed by undercover police officer Glen McNamara, author of the books Dirty Work and Savage Obsessions.

McNamara is currently on trial, along with disgraced former NSW police officer Roger Rogerson, for the execution-style murder of Sydney student and alleged drug dealer Jamie Gao this year.

Catholic Education Office records indicate Dunn was continuously employed at Marist College Penshurst from 1971 to 1987.

''It appears he held a number of different roles during that period,'' a Catholic Education Office spokesman said.