NSW police have offered a $250,000 reward for information that leads to the arrest of Julian Ingram, the suspected triple murderer accused of fatally shooting his pregnant former partner, her boyfriend and her aunt in Lake Cargelligo in January.

Officials have searched for Ingram, also known as Julian Pierpoint, 37, since 22 January. He was last seen driving a Ford Ranger ute with council signage.

Ingram is accused of murdering Sophie Quinn, 25, and her unborn child; John Harris, 32; and Nerida Quinn, 50. A 19-year-old man was also allegedly serious injured in the attack.

Police said multiple teams, including search and rescue and tactical operations, had been searching the Lake Cargelligo area for nearly two months to no avail. The reward reflects the need for broader community support, officials said, to help find the man.

“This was a shocking and brutal act of violence that has left families grieving and a community deeply shaken,” Yasmin Catley, the NSW minister for police, said in a statement. “The NSW police force will not stop working to locate Julian Ingram, and this $250,000 reward is about encouraging anyone with information to come forward.

“If you know anything about his whereabouts, now is the time to speak up. Even the smallest piece of information could help police find him and ensure those responsible for this horrific crime face justice.”

Paul Pisanos, the NSW police deputy commissioner for regional field operations, said the reward was about “bringing a resolution to the families and all those affected”.

Police have faced scrutiny over a decision to grant Ingram bail for allegedly assaulting Sophie Quinn two months before the alleged murder.

. Ingram pleaded guilty to two domestic violence-related offences over threats made against another woman in 2016, according to court documents obtained by Guardian Australia. A month later, he breached the AVO granted to protect that woman and was charged with an additional domestic violence offence.

Officials maintain that a risk assessment at the time found he did not pose an unacceptable risk and he had complied with court orders in the past.