The Courier-Mail has obtained a psychiatric report on Mr Williams’ half-brother, who was jailed in 1985 for being the “middle man” in the murder of a millionaire grazier near Mackay.

Robin Johann Williams, who changed his name to Jack Cooper after his conviction, told a psychiatrist before his trial that his half-brother was ­involved in the drug trade before turning to God.

Brisbane psychiatrist Dr Joan Lawrence included the information in a report to the Public Defender’s ­office for use in the preparation of Cooper’s defence against the murder charge.

The psychiatric report, dated April 4, 1985 and ­tendered as an exhibit in the Rockhampton Supreme Court, was the result of a 1½-hour interview by Dr Lawrence in Woodford Prison.

It paints a portrait of a dysfunctional family life marked by drugs, murder and violence.

“His half-brother Richard has turned to religion and is ­involved in the Church of the ­Assembly of God, a lay preacher, very strict, which contrasts to his early history, according to Williams, of being involved in drug dealing and smoking,” Dr Lawrence wrote.

The drug dealing allegation against Mr Williams is still to date untested and was made by a killer who may have had reason to lie.

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Through Labor state secretary Evan Moorhead, Mr Williams vehemently denied he was ever involved in dealing drugs.

Mr Moorhead said Mr Williams had only been involved in “youthful experimentation” in the use of drugs and had never had involvement in drug dealing.

Mr Moorhead said Mr Williams was not close to his half-brother, who was raised by his grandparents.

Cooper was originally charged with the 1983 murder of grazier David Parkinson but pleaded guilty to unlawful killing and was sentenced to nine years’ prison with hard labour.

He met notorious Sydney underworld figure Tim Bristow in jail and after his release was enlisted to work as a standover man on major Sydney building sites using the aliases Fix-It and Mad Dog.

Cooper was shot twice in the head at close range in 1991, just months after fronting a royal commission into building industry underworld links, in what police believed was a professional killing.

Cooper had told the commission it was okay to punch a man’s lights out, and was described by another witness as coming across “like a gangster”.

“If he couldn’t impress you with his threats, he’d threaten to do something to your wife or children,” a former associate told The Sunday Telegraph in 1991.

Police suspected Cooper’s death was linked to the Queensland murder case though officially no motive for the killing was ever uncovered.

But Mr Williams had his own theory. He refused to accept his half-brother had been murdered and believed he was working undercover for the authorities, his former associates and family say.

Mr Williams was among the small crowd, which included Bristow, to attend his stepbrother’s funeral.

Labor’s Evan Moorhead said Mr Williams was introduced to Mr Bristow but did no more than exchange greetings.

According to his ex-wife Carol, Mr Williams was the executor of his will.

“His (Mr Williams’) mum wasn’t allowed to identify the body. We wondered if it was him, whether he was actually in witness protection,” Ms Williams said.

Mr Williams apparently believed his brother was alive as late as 2009, when he told how a foe had left him alone after he name-dropped his brother.

“I said my brother was Mr Fix-It in New South Wales,” Mr Williams said in an interview with a Cairns law firm with whom he was in dispute.

“He’s allegedly dead now. We don’t think he is. He’s got a new identity, but you know.”

The firm publicly accused Mr Williams of extortion over his behaviour during the dispute.

Mr Moorhead said Mr Williams had not used his brother’s name in the dispute as a threat, and believes his half-brother is dead.

Mr Williams’ family troubles extended beyond the menace and thuggery of his half-brother.

The 1985 psychiatric ­report said Cooper remembered his stepfather (Rick Williams’ father) as a violent man who he recalled “belting the mother up”.

He also talked of the death of two of his half-sisters in a car accident while one was under the “influence of drugs”.

Another sibling, June Trattles, was “murdered by her husband who believed that she was unfaithful with her father-in-law,” the report stated.

“The husband, who was probably mentally ill at the time, murdered both his wife and father, and shut his wife’s body up in a disused freezer where it was not found for many days,” it continues.