The boyfriend of a missing Sydney mum has been charged with murder following the discovery of a woman's body in bushland Sydney's northwest.

The body is yet to be formally identified, but is believed to be that of 43-year-old Shereen Kumar, who has been missing since Wednesday.

Vincent Carlino, 37, who earlier this week told the Daily Mail he was "extremely worried" about his girlfriend, was arrested at a home in Dural just after 11.30pm on Saturday.

Vincent Carlino has been charged with Ms Kumar's murder. Photo / Facebook via news.com.au

He was taken to Hornsby Police Station and charged with murder in what police allege was a domestic violence incident.

Police will allege Carlino killed Kumar some time after 9pm on Wednesday night, wrapped her in plastic and tape, and left her body in bushland, The Daily Telegraph reported.

He was refused bail to appear before Parramatta Bail Court on Sunday.

The woman had been reported missing to police on Thursday morning after her family raised the alarm.

Carlino said she had left the house in her pyjamas and her not taken her phone with her.

"I've told police all of the places I think she could be," he said.

Carlino and Kumar, who are understood to have been living together at the time of her disappearance, took over the franchises of the popular Hornsby Mad Dogs & Englishmen pet walking service in October last year.

The Sydney mum, who was also a part-time model, had been featured in a variety of magazines, including French fashion publication Malvie and Amsterdam-based Selin Magazine.

Her disappearance sparked co-ordinated police searches of surrounding areas over the last three days, with assistance from the police air wing and dog unit.

About 5.50pm on Saturday, police located the body of a woman during the search in bushland off Laurie Rd, Dural.

A crime scene was established, which is being examined by specialist forensic police.

Police said investigations are continuing.

Anyone in Australia with information about this incident is urged to contact Crime Stoppers: 1800 333 000.

- Melissa Iaria and Carly Douglas, news.com.au