Jailed child rapist wanted to attack Cowan

A jailed child sex offender who was once a suspect in Daniel Morcombe's abduction was caught en route to assault the schoolboy's killer behind bars, a court has heard.

Douglas Brian Jackway, who has spent most of his adult life in prison for the serious sexual assault of two young children, appeared in Brisbane's Supreme Court on Monday for the annual review of his indefinite sentence.

The court heard the 39-year-old had received a heightened degree of attention in jail after he was falsely implicated in the death of the Sunshine Coast schoolboy.

Reading aloud, Chief Justice Catherine Holmes also summarised a litany of alleged outbursts such as being stopped trying to leave a jail unit in February with the intention of assaulting Daniel's killer Brett Peter Cowan.

He had also smashed up his cell, falsely claimed to have swallowed a battery and made threats to pour boiling water over staff who tried to take him for medical treatment, the court heard.

Forensic psychiatrist Donald Grant said Jackway had also injected himself with a ground up medication just before completing a substance abuse program.

Dr Grant noted there was a risk being released could threaten Jackway's feelings of emotional safety, raising the likelihood of him using drugs and alcohol and, in turn, committing a sexual offence while intoxicated.

But lawyer John Allen QC said some of his clients aggressive behaviour could be put down to a desire to appear tough in the prison environment.

Chief Justice Catherine Holmes reserved her decision.