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The ex-boyfriend of stabbed Sydney dentist Preethi Reddy died in a "deliberate" head-on collision a day before her body was discovered stuffed inside a suitcase, police say.
Investigators found Dr Reddy dead in the bag in her own car on Strachan Lane in Kingsford east of the city about 9.30pm on Tuesday.
She had been stabbed "numerous times".
The gruesome discovery came just hours after police issued a public appeal to find the 32-year-old from Penrith.
Dr Reddy was reported missing on Sunday after she failed to return home following a dental convention at St Leonards over the weekend.
She was captured on CCTV inside McDonald's at the Strand Arcade in Sydney's CBD about 2.15am on Sunday and appeared to leave alone.
She last spoke with her family about 11 that morning, saying she planned to head home after having a late breakfast.
NSW detectives now believe Dr Reddy stayed at a hotel on Market St on Sunday "with a man known to her".
Detective Superintendent Gavin Dengate today confirmed the pair were not in a relationship at the time but had been previously.
It was believed the man also attended the dental conference, a police source told AAP.
Det Supt Dengate said police spoke with the man before he died in a "deliberate" head-on collision on the New England Highway at Willow Tree, in the Upper Hunter, about 10pm on Monday.
"Early indications, it looks like the case (that he killed himself)," Det Supt Dengate told 2GB radio. "There's many a facet and areas that we'll investigate."
Investigators are appealing for more information about Dr Reddy and her whereabouts before her death, including any sightings, her mood and what she was wearing.
"Any little piece of that puzzle we can get off members of the public is very very much appreciated," Det Supt Dengate said.
It is understood Dr Reddy worked at Glenbrook Dental Surgery in the lower Blue Mountains.
"Glenbrook Dental Surgery staff are in mourning to hear the sad news about Preethi Reddy," her colleagues posted today.
A Facebook page was set up soon after Dr Reddy went missing, calling for people to "help find Preethi Reddy".
"It is highly out of character for Preethi to not contact family and loved ones," one post said.