Frank Ogboru was on holiday in London when he died
Police officers will not face charges in the case of a Nigerian businessman who died after being restrained.
Frank Ogboru, 43, was held by four officers during a disturbance outside a block of flats in Woolwich, south-east London, in September 2006.
A Crown Prosecution Service (CPS) spokesman said there was "insufficient evidence" to bring any charges.
The Metropolitan Police will now decide whether disciplinary action will be taken against the officers.
Police were called when Mr Ogboru, who was on holiday in London, became involved in an argument with a friend's girlfriend.
Witnesses, one of whom filmed the incident on a mobile phone, claimed officers had their knees and feet on Mr Ogboru as he "wailed like a dog" and said he could not breathe.
The CPS spokesman said: "Police experts on restraint who have watched the video were of the opinion that the officers never achieved control until moments before Mr Ogboru lost consciousness.
"The period of restraint was brief, taking only a few minutes."
He said that only if Mr Ogboru had been deliberately kept prone on his stomach for a "significant period" could it be decided that unreasonable force had been used.
"We therefore concluded that a jury would find that the restraint was not unlawful," he added.