Revealed: The mystery woman with accused killer chef Jacob Greig when he allegedly murdered Isaac, 15, near Wilton in south-west Sydney

EXCLUSIVE

A chef accused of killing a 15-year-old boy late at night was in a car with a former female colleague at the time of the alleged stabbing, while his heavily pregnant fiancée was at home.

It is alleged the teenager, Isaac, came across the red Hyundai i30 of duck breeder Johanna Martin, 21, on a side road near Wilton, southwest of Sydney.

But when he tried to get into the car and ripped off the rear door handle, father-of-one Jacob Greig, 32, reportedly got out and confronted him.

The chef is then accused of slashing the boy with a knife before the startled couple drove away as the boy jumped on the car and then fell into the undergrowth.

The teenager’s body was discovered in bushland the next morning by his friends who initially thought he had left the campsite and gone home.

The deadly confrontation is said to have happened after Ms Martin met Greig after his shift at the Bargo Hotel ended at around 10pm on Friday, November 8.

The pair then drove to a remote area near Maldon Weir in Wilton when Isaac approached them and pulled the door handle.

Police, who have since seized the car, claim video and audio of the incident from nearby CCTV captured the altercation.

Jacob Greig has been arrested and charged over the alleged murder of Isaac, 15

The teenage boy (pictured), who can only be identified as Isaac for legal reasons, was camping with friends in Wilton, south-west Sydney, when he was allegedly stabbed by Greig.

During a court hearing, Magistrate Robert Rabbidge was told that footage showed Greig getting out of the car and saying: ‘I’m going to get you bloody good.’

The chef TWhen he allegedly told Isaac: ‘I’m going to cut your bloody hand off’, the court was told.

Greig is then said to have jumped back into the car before Isaac tried to jump onto the moving vehicle as it drove away.

Greig and Martin made the short trip back to his home, where he left her and then allegedly threw his knife in the trash while his fiancée and child slept.

The next day, shortly after 4pm, Greig and Mrs Martin, accompanied by her parents, handed themselves in at Narellan police station.

Greig was arrested and charged with murder. Ms Martin has not been charged with any criminal offense and there is no evidence of any wrongdoing on her behalf.

Daily Mail Australia understands CCTV footage from neighbors at her Tahmoor home has been seized by detectives.

The vehicle, which still has green P plates, will also remain with police while it undergoes forensic examination.

Mrs Martin is a celebrated local duck and chicken fancier who has won awards for her prize-winning birds, and is a delegate of the Environmental Protection Authority.

Johanna Martin is said to have met Greig from work before they drove to a remote area

Isaac’s body was found by his friends on November 9 in bushland off Wilton Park Road in Wilton (pictured), southwest of Sydney.

Greig (pictured) was refused bail and will appear in Campbelltown Local Court on January 8, 2025

Greig faced Parramatta Local Court via video livestream on November 10, with three of his family members present.

During the hearing, Magistrate Rabbidge said there was ‘nothing more serious than the alleged murder of a 15-year-old’.

“The facts are quite extraordinary and appear to contain a significant amount of strong evidence,” he added.

“It is clearly an extraordinary case… Mr Greig faces decades in prison” if the charges are proven, the magistrate said.

“I must do my duty to the community and refuse him bail.”

Greig, who describes himself on social media as a ‘professional pyromaniac’, was refused bail and will appear in Campbelltown Local Court on January 8, 2025.

Family friend Donna Young has started a GoFundMe to help his struggling parents with funeral expenses.

“Izak was a beloved son, brother and friend. His life, full of promise and potential, was tragically cut short because of an (alleged) act of senseless violence,” she wrote.

“Isaac’s family – his mother, father and siblings – now face the unimaginable pain of not only grieving the loss of their precious son, but also dealing with the overwhelming costs associated with such a sudden tragedy to go.’

The fundraising page, which will cover the costs of his funeral and support his family and traumatized friends, has raised almost $30,000 to date.