The 37-year-old remains at large after an alleged domestic violence-related shooting spree at Lake Cargelligo in central-west NSW on January 22.
Ingram allegedly fatally shot three people, including his pregnant former partner Sophie Quinn and her aunt Nerida Quinn, hours after he visited a police station.
In a bid to crack the case, the NSW government has put up the $250,000 reward after Ingram, a council worker, was last seen driving a Ford Ranger ute with an emergency light bar on the roof.
Police need urgent help from the community to ensure no stone is left unturned, NSW Police Deputy Commissioner Paul Pisanos said.
"This is about bringing a resolution to the families and all those affected," he said.
"NSW Police is unrelenting in our quest to apprehend Ingram, but we need the community to come forward with any information that could assist."
In February, Assistant Police Commissioner Andrew Holland said he believed Ingram was receiving help from people.
He previously warned the public that police would arrest and prosecute anyone helping the alleged murderer access food and water across the outback region.
"To anyone who is aware of his whereabouts - let this reward be the prompt for you to break your silence and assist police," Mr Holland said.
Even the smallest piece of information could help police find Ingram, Minister for Police and Counter-terrorism Yasmin Catley said.Â
"If you know anything about his whereabouts, now is the time to speak up," she said.
Police previously said Ingram had access to a vehicle but were unsure if he abandoned his getaway ute.
An earlier tip-off led investigators to focus on the areas surrounding the remote outpost of Mount Hope, a former mining town about 90km northwest of Lake Cargelligo.
Two women claimed they came face-to-face with the alleged killer, saying he pointed a gun at them around Mount Hope.
An almost one-minute CCTV clip released by police showed the fugitive sporting a red cap and blue and yellow work gear while casually vaping outside Lake Cargelligo police station on January 22.
He is described as being of Aboriginal/Torres Strait Islander appearance, about 165cm to 170cm tall and of a medium build with short dark hair and brown eyes.
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