Reclusive tycoon Valery Morozov, who fled for Britain after exposing corruption in Russia, claims the sting means police and secret services in Moscow are paying 'close attention' to Mr Young's death.
Property developer Young, who was a 'deal fixer' for the rich, plunged four storeys and was impaled on railings outside his £3million London penthouse ten days ago.
He was once worth up to £2billion, owning six mansions, a private jet and several supercars, but lost it all in a Moscow property deal, leading to speculation the Russians were involved in his death.
Oher Russian sources suggest that the shock of finding his money had vanished drove Young to despair, depression and suicide.
Mr Young had been at the centre of one of Britain's most notorious divorce cases, which culminated in him being jailed for refusing to reveal how much money he was worth to ex-wife Michelle, 49. She said her ex-husband has up to £400million stashed offshore but Mr Young said he was penniless and £30million in debt.
It was later claimed in court by his embittered ex-wife’s legal team that Mr Young’s sudden and bizarre loss of his gigantic fortune was part of a plan entitled ‘Project Marriage Walk’.
Young said he lost his immense wealth in a huge property development project in Russia called Project Moscow - a plan to redevelop an industrial area of the Russian capital.
A High Court judge said in a ruling handed down yesterday, following a hearing before his death , that Michelle Young, was entitled to apply for a creditors' meeting to press for the appointment of new bankruptcy trustees to carry out the search.
Mr Morozov said he fears that Mr Young was stitched up by a group who left him with no control over his carefully-hidden offshore fortune.
And he believes Russian mafia could be connected to the death of former Kremlin insider Boris Berezovsky, who was found dead in his toilet near Ascot last year after fleeing Moscow fearing for his life.
Moscow gangs - 'often linked to ex-members of the Russian secret services' - specialise in offering 'shadow business schemes' to hide owners' wealth from taxes and prying governments, Morozov said.
He claimed 'these gangsters exploit the fact that many rich people have very limited knowledge about financial mechanisms' and grab control of a companies' wealth.
Such crimes are on the rise as Russia is plunged into economic crisis, it is claimed.
Morozov fears that Berezovsky was killed because he knew too much about these schemes used by the super-rich, and Young was similarly murdered even though police say there are no suspicious circumstances.
'I know that Young was also linked to Berezovsky,' he said from his UK hideout.
'I have information that Russian law enforcement agencies have paid close attention to Young's murder.
'He had similar problems - he declared he had no money but in reality it was hidden and our gangs have a lot to do with it.
'In my opinion, Young may have become a victim of such a gang, and probably this is why Moscow police is interested in his death.'
Mr Young is rumoured to have split with his reality star fiancée before he died.
Noelle Reno, an American model and TV presenter, has said his loss of wealth had always 'killed him', and in recent years it was known he had attempted suicide, spent time in rehab and was sectioned twice.
Neighbours said there was a furious row between them. She made a frantic call to police – moments before he fell from a fourth-floor window. Noelle had been angrily attempting to order him out of their shared apartment on Monday before he died.
A source said: 'He just turned up unannounced inside the flat. She said, 'What are you doing here? You're not supposed to be here.' He was manic, crazy and probably high. It escalated.
'Noelle removed herself from the situation by leaving the building and called the police on the way out.
'She told them, 'You might want to turn up, there's a crazy man here. He's gone mental. He won't leave.' Noelle headed off to a girlfriend's house. The police turned up at the apartment and then found him.'
Police say foul play was not involved and have given no credence to reports that Young's death was connected with the Russian mafia.
But one confidant claimed Scot was partying at the Dorchester on Park Lane when the Russian and Turkish mafia he owed money to held him over the edge of a balcony in 2012.
Scot's ex-wife Michelle also questioned him on his links to one of Britain's most notorious organised crime gangs just weeks before he plunged to his death.
She challenged her former husband over business connections to the Adams family, who have been linked to murder, drugs trafficking and money laundering.
But Mr Borozov believes Mr Young and Mr Berezovsky may have been murdered, which some of Young's friends have also said, claiming he 'owed money to the wrong people'.
Mr Borozov claimed: 'Many people in Russia are convinced that Boris Berezovsky was murdered.
'And one version is that he was murdered exactly because he knew all about these offshores and trusts abroad which are controlled by Russian gangs and earn millions of dollars to all those involved in these schemes.
'It is a huge industry and Berezovsky knew it well.'
He alleged: 'The reason why Berezovsky and his associates climbed up so quickly in 1990s lies in the same area - they were dealing with the money transfers for Boris Yeltsin.
'Later many gangs were shaped around this core. They call themselves legal companies which offer their services in running offshores.
'Imagine a Russian official who stole the money and did not pay taxes, and he seeks help in running an offshore company to take care of his wealth.
'These offshore management companies can build it up in a way that the official will be convinced he is still in charge of the money.
'But one day the money is gone and he can't prove anything.
'He can't go to court because it will ask about the origin of his money. He has no choice, but if he still does not want to keep low profile, he is killed.'
He said: 'These crimes are to do with the companies and their money kept offshore. The most frequent crime is the quiet replacement of the owner in an offshore company.
'A gang makes friends with the owner of an offshore, gains his trust, volunteers to run his offshore for him in a way that the owner poorly controls it.'
Then the owner suddenly finds that - through the murky trails needed to keep identities secret - he no longer has control of his own company.
A third death near Moscow of a Russian millionaire who lost a £53million divorce case in London could also be linked, he said.
This man, who cannot be named for legal reasons, was gunned down when 27 bullets were shot into his chauffeur-driven car earlier this year.
The death, would be the seventh linked to Young, with some observers calling it a 'ring of death' - a close circle of friends to die in unusual circumstances.
Mr Morozov said: 'He lived in London for a long time, then went back to Russia and was surprised to discover that his offshore companies do not belong to him any more but to somebody else.
'He was murdered because he got to know about it too early and too suddenly.
'But he was likely to be murdered anyway, sooner or later. I have information that Russian law enforcement agencies are linking his murder to Berezovsky's death.'
