The hunt for the killer who murdered a Brazilian business woman is ramping up with the spotlight now on one of her former lovers.

Authorities will today fly to Perth to speak with Cecilia Haddad's friends after she was found washed up by a kayaker on the Lane Cove River near Angelo Street, in Sydney's Lower North Shore on Sunday morning.

The man, believed to be her former lover, flew to Brazil on the weekend and is one of several persons of interest in the murder investigation.

Cecilia Haddad was found on the Lane Cove River near Woolwich at 10.15am on Sunday. (NSW Police) (Supplied)

Authorities have appealed for CCTV or dashcam footage of Ms Haddad's car - also believed to be key to piecing together her final moments - it was revealed the alleged former lover had left Australia and flown to Brazil in recent days.

Meanwhile, police have appealed for public assistance to uncover the movements of the logistics expert in the hours leading up to her death.

They are also seeking information from anyone who may have seen the 38-year-old or her car - a red 2013-model Fiat 500 sedan with a black rim, registration DJV50H - in the hours leading up to her death.

Ms Haddad was known as a "very friendly lady with a large circle of friends" in the Ryde area. (Facebook) (Facebook)

Authorities are now appealing for anyone with information, CCTV or dashcam footage including Ms Haddad or her car, a red Fiat 500. (Supplied) (Supplied)

Detective acting inspector of the NSW Police Homicide Squad Ritchie Sim told media today that Ms Haddad attended a barbecue on Friday night in the Ryde area and spoke with friends over the phone between 8am and 9.30 am on Saturday morning.

The businesswoman is then believed to have missed multiple appointments she was expected to attend on Saturday.

Her car was found parked at West Ryde train station late on Sunday afternoon.

Police at first did not believe Ms Haddad's death was suspicious. (9NEWS) (Nine)

Police said she went to a barbecue on Friday night, spoke to friends on Saturday but was not seen since Saturday afternoon. (9NEWS) (Nine)

"As a result, we are seeking the assistance of the public to help us piece together Cecilia’s movements leading up to her disappearance," Mr Sim said.

"We’re also seeking the assistance of anyone who has seen that vehicle throughout Saturday morning through to Sunday afternoon.

"We have been able to capture a lot of CCTV footage and we’re obviously canvassing for witnesses, and were continuing to canvass for CCTV footage and dashcam footage. My appeal goes out to people who may be in possession of further CCTV or dashcam footage."

The block of units where Cecilia Haddad lived in Ryde. Picture: Tim Davies (9news)

Ms Haddad was a mining executive from Brazil who was living in Ryde. (9NEWS) (Nine)

As part of ongoing investigations, police today examined the unit where she lived in St Anne's St, Ryde.

The 38-year-old had been working in Australia since 2007. She moved to New South Wales from Western Australia in 2016.

"Cecilia was a very friendly lady with a large circle of friends," Mr Sim said.

Ms Haddad's body was found on Sydney's Lower North Shore on Sunday morning. (9NEWS) (Nine)

"She worked professionally in Western Australia, continued her profession in Sydney and was a very well-liked person."

Her ex-husband flew in from Western Australia to formally identify her body and family in Brazil have been notified of her death. An autopsy was also carried out today.

Mr Sim said that, while it is too early in police investigations to identify suspects or persons of interest, authorities are urgently trying to solve the matter for Ms Haddad's "distraught" mother, who lives in Brazil.

Flowers have been laid out along the Lane Cover River near to where it is believed Ms Haddad's body was found. (AAP) (AAP)

Police are looking at tidal currents over the weekend to determine where Ms Haddad's body was possibly dumped into the river. (AAP) (AAP)

"It's important we don’t speculate as to what has occurred - we need to deal in facts wherever possible," he said.

"Like any mum or dad, they would be distraught wanting to know what happened to their daughter, so we need to find the answers to those questions."

Police are looking at tidal currents over the weekend to determine where Ms Haddad's body was dumped.

Along the Lane Cove River, flowers were also seen laid out along the water near to where it is believed the businesswoman's body was found on Sunday.