The defendant was thought to have started working on the scam almost immediately after he arrived in the UK from Nigeria in 2005, and was said to have carried on into 2012 while he was on bail following his arrest the year before.
His crimes were uncovered in a three-year operation led by the National Crime Agency with assistance from the Postal Inspection Service and Internal Revenue Service in the US.
When they raided his luxury apartment in Canary Wharf police discovered an ‘Aladdin’s cave’ of evidence pointing to an advanced fee scam.
Among 200 exhibits were notebooks containing the names, addresses, cash tallies and other personal details relating to 406 people. Police estimate that the fraud is likely to have run to at least £5 million and possibly as high as £30 million if all those in the notebooks suffered losses.
Steve Brown, senior officer in the NCA’s cyber crime unit, said the majority of Onyeachonam’s victims were from America.
He is thought to have selected his targets from a database known among fraudsters as a ‘suckers list’, which includes people who are believed to be susceptible to the tactics.
Mr Brown said: ‘Victims were sent an email from an alias used by Onyeachonam saying they had won an Australian lottery. They would be directed to ring him and he would say ‘if you send me money I will then release your lottery funds’.’
The lottery ‘winnings’ ranged from £2 million to £9 million and once they sent on cash victims were ‘hooked’ into the ‘unrelenting’ scam, he said.
He added: ‘Once they’ve got their claws into someone they won’t stop. As long as they keep sending them money they will keep going until there’s nothing left.’
Using the alias Dr Jeff Lloyds, Onyeachonam built up a rapport with his victims and continued extracting money from some for as long as seven years.
In order to make the required payments several victims took out high interest loans, forcing them to come out of retirement to repay the debts.
Some of those exploited by Onyeachonam suffered the added trauma of falling under suspicion themselves as they were used as ‘pawns’ in the criminal network to launder the proceeds of the fraud by sending on money from other victims or setting up business accounts.
Mr Brown said the scam had made a ‘mental wreck’ of victims, ‘hammering’ their life’s savings, forcing them to lose their homes and leaving them isolated from their friends and families.
Emails showed victims pleaded with Onyeachonam to send them money to pay for healthcare, while some died before he could be brought to justice.
The British victim was left with debts of £90,000 and was forced to sell her home, move into rented accommodation and return to work in an attempt to stave off bankruptcy.
An American victim lost her dream home and she no longer speaks to her sister or friend.
She described how the scam made her feel like she had been ‘raped over and over again’.
While he left a trail of destitution and devastation in his wake, Onyeachonam enjoyed the high life from the fruits of his deception.
Mr Brown said he lived a ‘cash rich’ lifestyle, earning the nickname ‘Fizzy’ for his taste for expensive champagne. Photographs show him surrounded by cash and bubbly in nightclubs.
His car collection included Porsches and Maseratis while his Thames-side flat was full of luxury brands such as Gucci and Louis Vuitton when it was searched by police.
Onyeachonam was the key figure as far as the ‘UK nexus’ was concerned but detectives believe this was part of an international enterprise.
The alleged mastermind or ‘chairman’ of the network is based in Nigerian capital Lagos and he is currently under investigation by authorities there.
Asked how many people were working on the global scam, Mr Brown said: ‘Name a country and there seems to be a connection. It’s been almost impossible for us to track everybody down. They’ve all got responsibility for their own country.’