Police searched for Reddy and found her vehicle, a grey Volkswagen Golf, parked on Strachan Street in the Sydney suburb of Kingsford at about 9.30 p.m. on March 5. Her body was found stuffed in a suitcase in her vehicle in a parking garage.
According to the police report, she and a "man known to her" stayed at a hotel in Market Street in Sydney's CBD on Sunday.
Dr Reddy worked at Glenbrook Dental Surgery in the Blue Mountains, around 70 kilometres west of Sydney.
In a shocking twist, Narde died on Monday night - a day after Dr Reddy was reported missing - in a head on collision with a truck near Tamworth in what police believe was a deliberate act.
The ABC understands the man who died was the key suspect in Dr Reddy's murder.
The police reported that they had spoken to Narde before his death as part of a preliminary investigation, claiming that the investigation had still been in its initial stages.
Detective Superintendent Gavin Dengate revealed officers grilled Narde while Dr Reddy was still the subject of a missing person's inquiry after the pair spent Sunday night together.
The suspect, Harsh Narde, who was her colleague at her previous workplace, was also found killed in a auto crash about 350 km from the place where Preeti's body was found. Police suspect that the accident of Narde was intentional and perhaps a suicide.
She bought two bottles of water before leaving, walking south towards Market Street.
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Dr Reddy has not been heard from since speaking to her family about 11am on Sunday.
She was captured on CCTV inside McDonald's at the Strand Arcade in Sydney's CBD about 4.15am on Sunday and appeared to leave alone.
Her sister, Nithya Reddy, posted on Facebook that she had previously been located at Hotel Urban in Greenwich on Sydney's lower north shore.
"On behalf of my family, I want to thank anyone who shared our appeals to find her, and those who provided information to the police and us over the last few days".
Her family reported that Harsh has been harassing her from some time.
She had been stabbed "numerous times", they said. "It takes a lot of effort to be a dentist and she achieved it. the family's so proud that they had a daughter like that", Anand told reporters.
Before her body was found on Monday night, a Facebook Group called "Help find Preethi Reddy" had been set up by the family to assist the investigation.
Preethi's disappearance is "out of character" and there are serious concerns over her welfare, a New South Wales (NSW) Police spokeswoman said.