He was sentenced to six years on a manslaughter charge, free for parole after two years, in 1993. In 2004, Nallajar was himself convicted of the rape of a minor. According to documents filed to the Supreme Court, Nallajar told a prison-appointed psychiatrist he he saw the nine-year-old girl walking alone and thought "I can have my way with her as no one is around". He went on to entice her with the promise of money and sexually assaulted her, including anally. The rapist was sentenced to eight years and declared a serious violent offender, who underwent a host of rehabilitation programs while imprisoned in rural far north Queensland.

In prison, Nallajar denied being attracted to young girls, saying he thought she was older and described her as "bigger" but a range of psychologists indicated he made a genuine effort at rehabilitation. But after serving the whole sentence thanks to what a sentencing judge said was "misconduct in prison" he reoffended just a week after his release in May 2011, this time luring an 11-year-old girl into a laundry. He grabbed her by the hand and began pulling his shorts down but three boys she'd been playing with in the yard outside managed to force their way in before he could sexually assault her. "I'm satisfied that your intention in taking the girl into the laundry and shutting the door, leaving her there alone with you was to sexually interfere with her," Judge Stuart Durward said in sentencing the man to five years in jail for the indecent treatment of children under 16 and deprivation of liberty. "She was 11 years of age. It was only the brave intervention the other children that prevented you, in my view, from giving effect to that intention."

Nallajar told various psychologists and program directors that he struggled with marijuana and alcohol, that his father was an alcoholic and he had seen violence, suicide and sexual assault on Palm Island. On June 20, the Attorney-General of Queensland applied to the Supreme Court to have Nallajar assessed by two psychiatrists and detained indefinitely for "care, control or treatment" under the Dangerous Prisoners (Sexual Offenders) Act 2003. Alternatively, she called on the courts to place "appropriate" conditions on his release, due on December 16 this year. After interviewing Nallajar on September 4, 2015, Amicus Medical Chambers psychiatrist Scott Harden found he had a high risk of re-offending and recommended if released, he have ongoing therapy and no unsupervised contact with girls under 16. Several other examining psychologists found Nallajar had a high to moderately high risk of re-offending in various assessments between 2008 and last year.

A hearing is due in court on Wednesday and Nallajar is yet to file any opposing material.