But it's thought he stuffed her body into a suitcase, loaded her into her vehicle and dumped the VW Golf in Kingsford near the University of NSW.
Her stabbed body was found at 9.30pm on Tuesday inside her grey Volkswagen Golf, in Kingsford.
She was last seen waiting in line at McDonald's in George Street on Sunday, the police said.
Detectives believe Dr Reddy stayed at a hotel on Market Street on Sunday "with a man known to her".
The man is believed to be her former boyfriend who was also attending the dental conference, a police source told AAP.
The 32-year-old from Penrith in western Sydney had been attending a dental convention at St Leonards over the weekend.
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According to the police, they spoke to Narde as part of the missing persons investigation before his death.
She told them she would head home after a late breakfast, and when she failed to return, her family contacted police.
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. Her death left her colleagues shaken.
She last spoke with her family at about 11am on Sunday, and nothing seemed amiss. Dr. Preethi Reddy went missing on Sunday and the police found her body in a auto trunk.
Nithya said the last activity on her phone was detected in the Sydney CBD at 1.47pm on Sunday, according to her mobile provider.
"I ask you all to think about her family right now and about giving them the space to actually to be in this space".
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Surveillance video showed her leaving a McDonald's in Sydney, apparently alone, around 2:15 a.m., 7 News Australia reported.
"It's very important for us because, right now, we are working for Preethi and we are working for Preethi's family as well", Detective Superintendent Gavin Dengate said on Wednesday.
The ABC understands Dr Narde was the key suspect in Dr Reddy's murder. The suitcase was found in her vehicle that was located in Kingsford area of Sydney.
Preethi's disappearance is "out of character" and there are serious concerns over her welfare, a New South Wales (NSW) Police spokeswoman said.
"Prior to this unthinkable event, she had been the happiest I'd ever seen her - she was living her best life", she added.
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