After 18 months examining more than 150,000 documents from decades of police records and coronial files, a landmark inquiry into potential gay hate-related deaths will hold its final public hearing.
Led by Commissioner John Sackar, a Supreme Court judge, the NSW inquiry has examined the unsolved killings of LGBTQI people that might have been hate crimes between 1970 and 2010.
The commission examined the deaths of 32 people, including former AC/DC manager Crispin Dye, US mathematician Scott Johnson, newsreader Ross Warren and retired schoolteacher William Allen.
Unsolved homicides plague NSW Police and the inquiry heard the force would need centuries to review all of its caseload, even if no more murders happened in the state.
The inquiry also shone a spotlight on social, legal and cultural factors affecting the LGBTQI community during the four decades leading up to 2010.
The death of rock manager Crispin Dye is among the suspected hate crimes under examination.
It examined whether NSW Police bias and indifference to attacks on gay men could have affected how the cases were investigated.
Hearings also revealed poor record-keeping practices by police with multiple examples of crucial evidence being lost, destroyed or misplaced over the years.
Senior counsel assisting the commission Peter Gray will deliver a closing address at the final sitting on Tuesday, when he is likely to address increasingly tense interactions with law enforcement that have marred the inquiry.
Police and their legal representatives have been criticised for the last-minute provision of documents and perceived lack of cooperation with the inquiry.
In turn, the commission heard detectives had blamed the extra workload from the inquiry for delays in reviewing unsolved homicide cases during their discussions with bereaved family members.
The special commission was the first of its kind anywhere in the world and was established following a NSW parliamentary probe.
A final report will be handed to the state's governor by December 15.