Details of his new accommodation were suppressed. Vincent, a sex offender originally from Canterbury, was most recently in a high-dependency unit at Rimutaka Prison, north of Wellington. In 1968, after earlier sexual offences against boys, he pleaded guilty to seven charges of indecent assault and was sentenced to the open-ended term of preventive detention. He was eligible to be considered for parole after seven years and went before the Parole Board most years after that. cameron burnell/Stuff Human rights lawyer Tony Ellis was relieved Alf Vincent did not die in prison. (File photo) But after 52 years he was still serving the sentence because the Parole Board said he remained an undue risk to the safety of the community.