The 32-year old Preethi Reddy was last seen on CCTV on Sunday morning (3rd March 2019 2.15 am) at McDonalds at the Strand Arcade 375 George Street.

She is suspected to have been killed by her boyfriend who stabbed her to death on being told by her she was moving away to another friend and giving up his relationship.

He is said to be another Indian-origin dentist, Harshvardhan Narde, 34, who died in a car crash on the New England Highway on Monday night, a day after his ex-girlfriend was reported missing, according to New South Wales Police (NSW).

The head-on collision with a truck, 340 km from where Reddy's body was found, is believed to have been deliberate, police said. It was south of Tamworth Monday night.

The police said they spoke to Narde as part of the missing persons investigation before his death. They said the investigation was still in its early stages.

One report said Preethi stayed at a hotel on Market Street in Sydney’s CBD on Sunday with her ex-boyfriend.

Preethi reportedly attended a dental convention at St Leonards at the weekend and spoke to her family about 11 am on Sunday.

Preethi Reddy worked at Glenbrook Dental Surgery in the Blue Mountains, about 70 km west of Sydney.

"It's devastating, and this is completely out of character," dental assistant Chelsea Holmes of Glenbrook Dental Surgery said, according to the Australian Broadcasting Corporation. "We got a call on Monday asking if she had turned up to work... and now we are just hoping and none of us have been able to sleep. I spoke to her last Thursday and it was 'see you next week' and completely normal," she said adding, Now I am just praying she will be found, Ms Holmes said.