Brazilian woman 'was on a high' after becoming an aunt just days before ...

The happy life and future plans of the woman whose body was found face down in a Sydney river have been revealed by her friends, as police dig deeper into her recent relationships in the hope of finding her alleged killer.

Brazilian mining executive Cecilia Haddad, 38, had celebrated becoming an aunt for the first time just days before her fully-clothed body was discovered floating in the Lane Cove River on Sunday morning.

Police believe she was murdered. 

But in the days before kayakers made the gruesome discovery, friends have recalled how Ms Haddad was 'on a high' after news her brother in Rio de Janeiro had welcomed a child with his wife.

Ms Haddad had also recently purchased a new apartment near her current home in Ryde where she was hoping to move on following a break-up with her ex-boyfriend Marcelo Santoro, who is a person of interest in the case.

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Cecilia Haddad (pictured) had become an aunty for the first time just days before her body was found in a Sydney river. NSW Police suspect the Brazilian mining executive was murdered

Cecilia Haddad (pictured) had become an aunty for the first time just days before her body was found in a Sydney river. NSW Police suspect the Brazilian mining executive was murdered

In the week prior to her death, Ms Haddad's brother and sister-in-law (both pictured at back) had welcomed a child. Ms Haddad's ex-husband Felipe Torres (front left) is also pictured

In the week prior to her death, Ms Haddad's brother and sister-in-law (both pictured at back) had welcomed a child. Ms Haddad's ex-husband Felipe Torres (front left) is also pictured

Friends of Ms Haddad said she had 'been on a high' after news her brother (left) and sister-in-law (right) had welcomed a child

Friends of Ms Haddad said she had 'been on a high' after news her brother (left) and sister-in-law (right) had welcomed a child

Friends of the businesswoman said that after a tough few months, things were finally looking up .

'She had a lot to look forward to and there was light at the end of the tunnel,' a close friend told Daily Mail Australia.

'She had just become an aunty and was also looking forward to moving into her new apartment which was nearing completion. 

'She was so excited, about many things... it was great to see her on a high.'

Police are hoping to check the alibi of Ms Haddad's ex-lover and business partner Mr Santoro, who is also from Brazil.

The 40-year-old is believed to have flown back to Rio de Janeiro at the weekend after moving his journey home forward by several days.

Mr Santoro's sister told Daily Mail Australia she was expecting him to arrive home this week, but had no idea that he was already believed to be in the country.

'I really don't know what is happening... he was due to come home this week,' she said.

'They had been dating for one or two years. Now, many people from Australia are writing me to ask about him and her.'

Police wish to speak to Marcelo Santoro (centre) over the suspected murder of Ms Haddad, his ex-girlfriend and business partner. Mr Santoro is believed to have flown home to Brazil at the weekend, several days earlier than initially planned

Police wish to speak to Marcelo Santoro (centre) over the suspected murder of Ms Haddad, his ex-girlfriend and business partner. Mr Santoro is believed to have flown home to Brazil at the weekend, several days earlier than initially planned

Ms Haddad (pictured), a Brazilian mining executive, was found floating in the Lane Cove River on Sunday

Ms Haddad (pictured), a Brazilian mining executive, was found floating in the Lane Cove River on Sunday

A police source said Mr Santoro's sudden departure was 'obviously suspicious', but stressed he was far from the only person of interest in the case. 

'We definitely would like to speak to him but there's definitely other people in Sydney we would like to talk to,' the source told Daily Mail Australia.

The Federal police will have to contact authorities in Brazil to ask for assistance in an overseas investigation.

It comes as Ms Haddad's mother begged police to 'catch the monster who killed her daughter' and told of her heartbreak at being stuck on the other side of the world.

'I do not know if I will survive this tragedy... maybe if they arrest the murderer, I may have some relief,' Milu Muller told the Sydney Morning Herald.

'I would love to be there with my beloved and

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