The ex-boyfriend of a murdered Brazilian national, 38, reportedly flew home to Brazil two days earlier than he initially planned, as police say they want to question him as part of the investigation.
Cecilia Haddad's body was discovered floating in the Lane Cover River, on Sydney's North Shore, about 10.45am on Sunday.
'Flight records are being checked to see when he actually left the country and when he was originally booked to leave,' a police source told The Daily Telegraph.
'Obviously he is a person of interest and someone we need to talk to but there are others.'
Cecilia Haddad's body was discovered floating in the Lane Cover River, on Sydney's North Shore, about 10.45am on Sunday
Ms Haddad was reported missing on Sunday, just hours after her body was pulled from the water (body pictured)
The former lover flew from Sydney to Rio de Janeiro at the weekend. He brought his flights forward by a couple of days, the publication reported.
New South Wales Police said detectives were looking into the man's flights.
While they want to speak with him, police stressed Ms Haddad's ex-boyfriend was not a suspect in the murder case.
Detectives confirmed Ms Haddad was murdered at the weekend, ruling her death out as an accident or suicide, but did not reveal why they came to this conclusion.
On Wednesday night, Ms Haddad's close friends made a plea for her killer to come forward and revealed she had been using dating websites since her and her husband divorce.
Ms Haddad enjoyed a BBQ with friends on Friday night, and spoke with a friend over the phone on Saturday morning, which was the last known contact with the Brazilian national before her body was discovered.
Cecilia Haddad is pictured with her friends Carolina Camara and Rita Maciel
Police are wanting to speak with the ex-lover of murdered Brazilian woman Cecilia Haddad, 38, (pictured) whose body was discovered floating in a Sydney river on Sunday
Caroline Camara, the mining executive's close friend from Perth, told News.com.au said she spoke with Ms Haddad every day and that Ms Haddad seemed to be in a 'wonderful mood' on Friday.
But when Ms Haddad did not return calls on Saturday and Sunday, Ms Camara said she knew something was wrong and called the police.
Her grieving friend said she was working closely with the police to help them catch the killer.
'I know personal things about Cecilia that I am going to share fully with [the police], if it's going to help in some way, I hope so. She confided a lot in me,' Ms Camara told the the publication.
'It's a great loss, she was full of love, very vibrant and loved by many.'
Speaking about the loss of her friend on Wednesday, Caroline Camara said Ms Haddad was 'a wonderful person' (Ms Camara with Rita Maciel)
Ms Haddad was reported missing on Sunday, just hours after her body was pulled from the water.
Distressed residents first thought a young child's body had been found, until police arrived and confirmed it was an adult.
Ms Haddad's ex-husband, who now lives in Western Australia, flew to Sydney on Monday to help police with the investigation.
He also had the harrowing task of accompanying homicide squad detectives to Glebe Morgue to identify his former wife's body.
Ms Haddad (left, pictured with a friend) was reported missing just hours after police pulled a woman's body from the Lane Cove River
Ms Haddad's ex-husband (left) flew from Perth to Sydney to help police with their investigation and identify the 38-year-old's body
Mystery surrounds the suspected murder of popular Brazilian mining executive Cecilia Haddad (pictured) whose body was found floating in a Sydney river