Brazilian woman's ex-lover and business partner 'person of interest' in her ...

This is the ex-boyfriend and business partner of a Brazilian mining executive police are looking to speak to over her suspected murder.

NSW Police have been trying to speak to Marcelo Santoro in relation to the death of Cecilia Haddad, 38, whose body was floating found in the Lane Cove River, in north Sydney, on Sunday.

Mr Santoro is believed to have flown back to South America on Saturday or Sunday, having moved his journey home forward by several days. 

He isn't regarded as a suspect but one of a number of persons of interest, and police want to check his alibi. 

Mr Santoro's sister told Daily Mail Australia she was expecting him to arrive home this week, but had not heard from him in recent days.

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.

Police wish to speak to Marcelo Santoro (centre) of the suspected murder of his ex-girlfriend and business partner Cecilia Haddad. 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) of the suspected murder of his ex-girlfriend and business partner Cecilia Haddad. 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 a Sydney river on Sunday

Ms Haddad (pictured), a Brazilian mining executive, was found floating in a Sydney river on Sunday

It comes as Ms Haddad's mother (left) begged NSW Police to 'catch the monster who killed her daughter' (right) and told of her heartbreak at being stuck on the other side of the world

It comes as Ms Haddad's mother (left) begged NSW Police to 'catch the monster who killed her daughter' (right) 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 adored daughter, but I had cardiac surgery and I still do not have [my] doctor's permission for long flights.'

Mr Santoro's sister told Daily Mail Australia she had no idea her brother had flown to Brazil earlier than expected.

'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.'

Daily Mail Australia has confirmed that Mr Santaro and Ms Haddad began a business partnership in mid-2017, launching the disability service provider D.Care. 

Both company and its website were registered in the friends' names. The company's principal place of business

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