Inside the vehicle, they discovered Reddy's body in a suitcase, showing multiple stab wounds.
Her last image was recorded at a McDonald's outlet on George Street in Sydney's Central Business District around 2.15 a.m. on Sunday. Police said that Preethi stayed at a hotel on Market Street in Sydney's CBD on Sunday with her ex-boyfriend, who was killed in a head-on collision with a truck on the New England Highway, south of Tamworth Monday night.
The Glenbrook dental surgery where Dr Reddy worked was closed on Wednesday with a sign on the door that said: "Due to tragedy concerning our beloved colleague, the surgery will be closed for the time being".
Narde died after his BMW vehicle collided with a truck on the New England Highway on Monday night, a day after his ex-girlfriend was reported missing, New South Wales Police (NSW) said.
The appeal comes after another Western Sydney woman disappeared in Parramatta two months earlier.
Police confirmed they spoke to Dr Reddy's former partner as part of the missing persons investigation, before his death.
Police said her failure to contact family for such a long time was out of character and they had serious concerns for her welfare.
"I can not qualify exactly what has happened and I won't put it out there because if we're wrong and it's not substantiated then we're doing a disservice to Preethi and her family", Detective Superintendent Gavin Dengate told the ABC News.
Three days later, the Australian woman's body was found stuffed in a suitcase in an abandoned auto.
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Her family didn't know if she attended the parade, where she stayed on Saturday night, where she was on Sunday morning, or what happened to her auto.
Before her body was found, a Facebook Group called "Help find Preethi Reddy" had been set up by the family to assist the investigation.
Her ex-boyfriend has also died in a road accident that appeared deliberate, they said.
Nithya said the last activity on her phone was detected in the Sydney CBD at 1.47pm on Sunday, according to her mobile provider.
"The weird thing I noticed that night was that he took down his Facebook shortly after the conference".
Her remains were found last night in Strachan Lane, just a few hundred metres from Anzac Parade and about 700m from the University of New South Wales.
A Telugu-origin doctor, Preeti Reddy, based in Sydney in Australia, was found murdered after she went missing five days ago.
According to report, it was understood that Narde was the key suspect in Reddy's murder.
Numerous patients of Reddy posted messages of condolences for her family on the surgery's Facebook page.