Jamal Khashoggi, 59, is thought to have been tortured, murdered and dismembered by a 15-strong team of Saudi agents, though the investigation is ongoing.
His uncle, Adnan Khashoggi, who died last year at the age of 81, was reputed to be the richest man in the world in his prime, with a net worth of up to $4 billion in the early 1980s.
Jamal Khashoggi, a Washington Post reporter who spent much time in the west, on holiday
American actress Elizabeth Taylor (right) is welcomed by Saudi businessman Adnan Khashoggi (left) and his wife Shahpari (cenre) in Istanbul’s Beyberbeyi palace in 1997
Adnan Khashoggi with American TV correspondent Barbara Walters in the 1980s
Dodi Fayed ion Canada in the late 90s – before he and Princess Diana were killed in a car crash
Princess Diana and Dodi Al Fayed in St Tropez in 1997 – before a car crash killed them both
After a succession of business failures, and hunted by the law, he was forced to sell his $70 million super yacht – which appeared in the Bond film Never Say Never Again – to Mr Trump.
The vessel, thought to have been the best yacht in the world at the time, included a patisserie, a hair salon, a cinema, an operating theatre, and a disco with laser beams that projected Mr Khashoggi’s face.
Its cabins were lined with chamois leather and bird’s eye maple and the bathrooms finished in onyx which was hand-crafted by Italian master craftsmen.
Mr Trump said at the time: ‘I was buying a great piece of art’.
The lavish power symbol had accommodation for 52 people and a helicopter landing pad to access the shore. It was the scene of extravagant parties before the arms dealer fell on harder times.
Some of the most famous and powerful people in the world had partied there; on one occasion, five heads of state, three of them kings, were being entertained aboard.
After a succession of business failures, and hunted by the law, Adnan Khashoggi was forced to sell his $70 million super yacht – which appeared in the Bond film Never Say Never Again – to Mr Trump
The lavish power symbol had accommodation for 52 people and a helicopter landing pad
Adnan Khashoggi and his wife attend ‘The Best ‘ Awards 2009 at Salon Hoche on December 14, 2009 in Paris
But it was not just a place of pure pleasure. The 150 telephones were used to arrange arms deals and commodities trades that were signed in international waters, freeing the parties from national law.
At the height of his wealth and renown, Mr Khashoggi was a household name around the world, spending $250,000 a day. His conspicuously glamorous lifestyle was the talk of the gossip papers and he often rubbed shoulders with celebrities.
One of his daughters from his first wife, Petrina, was revealed in 1999 to actually be the lovechild of disgraced Conservative MP Jonathan Aitken.
Other relatives also had powerful connections. Dodi Fayed, the lover of Princess Diana who was killed at her side in 1997, was a second cousin of the vanished journalist.
But his influence could hardly compare to that of the wealthy arms dealer.
The Saudi businessman’s early career was as a construction magnate. He then used his connections to make huge commissions after introducing Western firms and Saudi rulers to agree defence and infrastructure deals.
His star began to wane, however, when a string of bad business decisions resulted in a haemorrhaging of money from his empire.
Describing his fall from grace, Mr Trump told Vanity Fair: ‘Khashoggi was a great broker and a lousy businessman.
The team of forensics experts were sent in amid reports that the building has been repainted in the last two weeks
A team of cleaners entered the Saudi consulate in Istanbul today ahead of an inspection by Turkish and Saudi officials
The crack team of investigators could be seen marching through the door which Jamal Khashoggi walked through two weeks ago
‘He understood the art of bringing people together and putting together a deal more than almost anyone – all the bull****ing part of talk and entertainment – but he never knew how to invest his money.’
Mr Khashoggi’s downfall accelerated when he was implicated in the Iran-Contra affair, a political scandal in which American officials secretly facilitated arms sales to Iran, in violation of an embargo.
Mr Khashoggi, the master deal broker, was named as a prominent middleman in the affair, and in 1989 was indicted for fraud.
He had already been in custody in Switzerland, where he had been fighting extradition for three months. He eventually agreed to go to the United States after prosecutors agreed to soften his charges, and he was acquitted in 1990.
Beset by business woes in the mid-1980, the magnate took out a $50million loan and put his beloved yacht, symbol of his influence and potency, up as collateral. In 1987 he defaulted and the vessel was seized by a Swiss holding company.
Mr Trump jumped at the chance, acquiring the ship for a knockdown price of $30million without even having boarded her.
Mr Khashoggi was concerned that the yacht, which was named after his daughter Nabila, be given a new name. Mr Trump secured a $1million discount to agree this, and christened her Trump Princess.
He then spent $8.5million refurbishing the vessel. She arrived in the United States on July 4 1988, in time for a huge party thrown by the Trump family.
This week, the missing journalist’s fiancé wrote an article for the New York times in which she remembered her betrothed as a ‘lonely patriot’ who stood up to the Saudi rulers.
‘I saw reports about President Trump wanting to invite me to the White House,’ she wrote.
‘If he makes a genuine contribution to the efforts to reveal what happened inside the Saudi cansulate in Istanbul that day, I will consider accepting his invitation.’
Jeremy Hunt backs urgent probe into disappearance of Saudi journalist
Foreign Secretary Jeremy Hunt has confirmed his support for an urgent investigation into the disappearance of Saudi journalist Jamal Khashoggi, during a meeting with his Turkish counterpart.
Mr Khashoggi, a writer with the Washington Post, was reportedly killed while visiting the Saudi consulate in Istanbul. Turkish authorities claim to have audio and video recordings of the alleged murder.
Mr Hunt met Turkish foreign minister Mevlut Cavusoglu on Monday and pledged support for a credible and thorough investigation into Mr Khashoggi’s disappearance.
Following the meeting, the Foreign Secretary said: ‘The case of Jamal Khashoggi remains deeply concerning. The UK fully supports the Turkish investigation into the incident.
‘We have been urging Saudi Arabia to co-operate fully with the investigation. There remain questions about the disappearance of Mr Khashoggi that only Saudi Arabia can answer.
‘To that end, we welcome King Salaman’s and President Erdogan’s agreement of yesterday to establish a joint working group and the Saudi decision to ask the prosecutor general to establish an internal investigation into Khashoggi’s disappearance and hold people accountable if the evidence warrants it.’
A critic of Saudia Arabia’s Crown Prince Mohammed bin Salman, Mr Khashoggi was living in self-imposed exile in the US and writing opinion pieces for the Washington Post before he vanished.
Saudi Arabia denies any involvement with Mr Khashoggi’s disappearance and has dismissed the allegations as ‘baseless’.