A convicted paedophile and former priest has admitted further historic offending, this time against a boy aged under 16 in the Waikato.

Mark Mannix Brown was jailed for 26 months in August after admitting four representative charges of indecently young boys during the 1970s.

Brown, now 74, was first jailed in 1990 after admitting molesting young boys while he worked as a priest in the Catholic Church around Hamilton and Auckland in the 1970s and 80s.

Then in May, he admitted sexually assaulting three young boys before he was sentenced in August.

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Today, he was back in the Hamilton District Court, when through lawyer Mark Sturm, he admitted a charge of indecently assaulting a boy aged under 16 at Raglan sometime between December 31, 1976 and December 31, 1977.

Sturm said as his client was already in jail he said there was no need for a new pre sentence report or a restorative justice conference and sentencing should be expedited.

There was no resistance from the Crown, so Judge Simon Menzies convicted Brown on the new charge and remanded him in custody for sentencing later this month.

Brown is currently serving a prison term for historic offending against a 9-year-old altar boy, a 16-year-old whose dad had died and mother was dying of cancer, and a 6-year-old orphan.

Two of the boys were living in an Auckland orphanage, another was at home with family but attended the same church where Brown was a priest in Hamilton.

Brown had been living in Auckland after being released from prison in the 1990s after serving 15 months' jail for offences against young boys, before a second lot of charges were laid last year.

The latest victim was understood to have come forward to police after reading about Brown's offending in the Herald earlier this year.