Julian Ingram, 37, was accused of killing his pregnant former partner Sophie Quinn, her aunt Nerida Quinn and a third person at Lake Cargelligo in western NSW on January 22.
Ingram was believed to have committed the murders just hours after reporting for bail at a local police station on domestic violence charges committed against Ms Quinn.
Nearly five months after the council worker went on the run, officers found the body of a man believed to be Ingram alongside a firearm and his getaway vehicle about 100km away from the town.
An ongoing independent investigation into the police search as well as a future coronial inquest into the circumstances leading up to Ingram's death will inform any reforms to domestic violence monitoring, the police commissioner said.
"We respond to over 160,000 calls for service each year, which is one every three minutes, we charge over 33,000 offenders with assault-related matters," Mal Lanyon told reporters on Tuesday.
"We are committed ... to review the circumstances of the police response to domestic and family violence and bail."
The news was welcomed by the 1500-person town, as mayor John Medcalf hoped it assuages residents' fears.
"People - especially the families involved - were just worried he might come back," he told AAP.
"It's something you never expected to happen out in this part of the world.
"We're still going to have to live with it, but certainly this does help with a bit of closure."
Ms Quinn, 25, and her friend John Harris, 32, were killed when Ingram alleged fired bullets into a dark hatchback about 4.20pm.
Soon after, Ms Quinn's 50-year-old aunt was shot dead at a home that was a two-minute drive away.
Kaleb Macqueen, 19, was also shot at the home but survived with serious injuries.
For weeks, officers scoured nearby bushland looking for signs of Ingram but months passed without any significant breakthroughs.
That left town leadership feeling helpless as locals and outsiders asked for updates.
As leads dried up, police offered a $250,000 award for information leading to his capture.
Mr Lanyon said despite the discovery of the body, no information was given to police that would qualify for the reward.
"The actual reason why (the body) wasn't located, we'll discover further as we go through, but I thank our police, I thank those services that helped for their commitment to search," the commissioner said.
"Our firm focus has been to put him before the court (but) yesterday's outcome we hope does bring some closure for the families of the victims."
Though the body has not been formally identified as Ingram's, the 37-year-old's licence was found with it, and the accompanying vehicle's licence plate matched the registration of the ute he used on the day of the shootings.
The firearm found is also believed to be match for the one used in the murders but full ballistic analysis will take place to confirm, Mr Lanyon said.
There had been no positive sightings of Ingram since he left town on January 22.
By the time the body was discovered, it was in a "very decomposed state", police said.
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