Notorious prison inmate Bassam Hamzy quizzed over teen’s murder

One of Australia's most notorious prisoners has been arrested over an alleged ice syndicate uncovered during the investigation into the execution-style murder of a Sydney teenager.

Bassam Hamzy, 40, was taken from Goulburn Supermax to Goulburn Police Station this morning and formally arrested.

He is being questioned by homicide detectives.

Solicitor Martin Churchill, 62, was also arrested at a Glebe home this morning and taken to Newtown Police Station for questioning.

Police said the arrests relate to "alleged commercial drug supply and participation in a criminal group".

The alleged syndicate was uncovered by officers investing the murder of Brayden Dillon, 15, who was shot in the head in his bed at his Glenfield home on Good Friday in 2017.

Brayden was rushed to hospital in a critical condition but later died.

The Homicide Squad's acting commander, Detective Acting Superintendent Mark Henney, said police investigating the murder had uncovered details of drug supply in the state's Riverina and Illawarra regions.

Police were aware of the drug operation but until now had not been able to determine the leaders of the alleged syndicate. 

"During that investigation, we became aware of organised criminal activities that were being directed by an inmate of a high-security prison complex," he said.

"The directing of that criminal activity was being facilitated through the client-solicitor communications with his solicitor."

Det. Act Supt Henney said any links between the alleged drug syndicate and Brayden's murder were still being investigated.

"There are a lot of different moving parts of people who have played various roles, particularly after the murder," he said.

Brothers 4 Life gang founder Hamzy has been in prison for more than two decades after he was jailed for the murder of a teenager outside a Sydney nightclub in 1998.

Since his murder conviction, Hamzy has also been found guilty of running a drug ring from his cell.

He was also involved in a brawl with fellow high-profile inmate and convicted terrorist Talal Alameddine in October last year.

Seven people have previously been charged by detectives investigating Brayden's murder and remain before the courts.

Police allege the murder was a revenge attack over the death of a teenager in a brawl.