The inmate who attacked Daniel Morcombes killer, Brett Cowan,is today a free man after gaining release on parole.
Adam Davidson attacked Cowan last year after watching his movements for a month to work out the best way to harm him.
Davidson waited until Cowan was playing cards with other prisoners and poured a mop bucket of boiling water over his head then beat him with it.
Davidson claimed it was a vigilante attack when he appeared in court, telling investigators he attacked Cowan for "a little bit of retribution" and he wanted him "to feel the pain like somebody like Daniel Morcombe has felt."
Judge Ian Dearden sentenced Davidson to three years' jail for the attack but with time already served and parole, Davidson is now free on early release.
13-year-old son Daniel Morcombe disappeared from a bus stop near his Palmwoods home on December 7 2003.
It would take almost a decade for the Morcombes to find out what happened to their son.
Paedophile Cowan was charged with Daniel's abduction and murder in 2011 and in 2014, was found guilty of murder and was sentenced to life in prison. He will not be eligible for parole until 2031.
Post continues after video: Daniel Morcombe's twin baby joy