POLICE have pleaded for an inmate who escaped from a New England prison to hand himself in as a murder probe into his mother's disappearance continues.
On Tuesday, police announced a $350,000 reward for vital clues in the case of 71-year-old Nadire Sensoy - the mother of missing jail breaker Selim Sensoy.
Selim has been on the run since fleeing the low-security prison farm at Glen Innes on May 23, sparking a major police manhunt across the New England. He has not been charged in connection with the disappearance.
"Selim, give yourself up mate, we need to see you, we need to speak to you in regards to you escaping from the Glen Innes Correctional Centre," Blacktown Police Superintendent Stephen Egginton said on Tuesday.
"So the best interests for him is to come forward and present himself to police."
Police confirmed on Tuesday he is a person of interest in his mother's disappearance.
The 71-year-old grandmother disappeared in December 2018 from her Prospect home in Sydney and hasn't touched her bank account since.
Police now suspect she met with foul play, but they're are yet to find a body.
Her family said she's not the type to up and leave, and now a $350,000 reward is on offer to help catch her killer.
"It is quite perplexing that we haven't seen or heard anything in regards to Nadire's disappearance since that time," Superintendent Egginton said.
Selim has close contacts on the Mid North Coast and in Queensland and is one of the main people police investigators want to speak too.
Police suspected he stole a John Deere 6520 tractor from a property off the Gwydir Highway, the night after he escaped from prison.
The 44-year-old inmate disappeared without a trace on the morning of May 23. Police confirmed he was last seen at 10am, but the alarm wasn't raised until midday by Corrective Services officials.
Police were then called in and a large-scale manhunt mounted for the prisoner.
The police helicopter, dog squad and other specialist police scoured parts of the New England, including out to Moree and east to the coast, but failed to find any trace of him.
Police said Nadire is a "family lady who was dearly loved by her neighbours and those that knew her".
In an emotional press conference, her daughter Turkan Alagoz said her mother was well-known, had lived in the Prospect area for 40 years and used to pass on her baking treats.
"She's very respected by all her neighbours even some of them calling her 'aunty', so she just wouldn't up and leave without telling," she said.
"It's been so difficult not knowing where mum is and not being able to speak with her.
"Please if anyone knows where she is or has some information that can help the police find her please reach out, please let us know where she is, we need some sort of information."
New England police have warned the public not to approach Selim if he is sighted, but rather call Triple Zero immediately.
Sensoy is described as being of Mediterranean or Middle Eastern appearance, about 175 to 185cm tall, with a medium build, and brown eyes and grey hair.
He was last seen wearing prison greens.
Anyone with information on Nadire's disappearance is urged to contact Blacktown police or Crime Stoppers.
"We're calling for anyone that can assist in locating Nadire or anything to do with the suspicious nature in which she hasn't been seen to come forward or let us know through Blacktown police or Crime Stoppers," Superintendent Egginton said.