Secret past of fitness trainer to stars such as David Cameron who was jailed ...

Adeel Khan (pictured) is a fitness trainer to the stars who was jailed for life for murdering a drug addict along with his older brother

Adeel Khan (pictured) is a fitness trainer to the stars who was jailed for life for murdering a drug addict along with his older brother 

A celebrity fitness instructor who mixes in circles with the super-rich is a convicted murderer who spectacularly turned his life around while still in prison, MailOnline can reveal.

Adeel Khan counts stars such as Joan Collins, Natalie Imbruglia, Jemima Khan, Rod Stewart's ex-wife Rachel Hunter as clients and rubs shoulders with the likes of David Cameron, Mark Ronson and actor Cuba Gooding Junior. 

A host of celebs recently celebrated his 32nd birthday at the exclusive Chiltern Firehouse.

But MailOnline can reveal how Khan, popularly known as Adz, was sentenced to life in jail at the age of 16, with a recommendation that he serve a minimum of nine years for his involvement in the murder of a drug addict in December 2003.

He was part of a gang led by his older brother Nadeem, a notorious Rotherham drug dealer known as 'Big Nad,' who attacked David Callaghan over an unpaid drug debt and is still serving a life sentence for the crime.

In prison, Khan qualified as a personal trainer and was commended by staff for his other work, which included raising money for charities and helping visitors with special needs. 

Since his release from prison, Khan (pictured with David Cameron, left) Khan was turned his life around and now rubs shoulders with the rich and famous, counting some of them as clients

Since his release from prison, Khan (pictured with David Cameron, left) Khan was turned his life around and now rubs shoulders with the rich and famous, counting some of them as clients

Khan (pictured with Paris Hilton, centre) was released on parole in 2010 after a judge reduced his minimum term because of his 'exemplary conduct and determination to rebuild his life'

Khan (pictured with Paris Hilton, centre) was released on parole in 2010 after a judge reduced his minimum term because of his 'exemplary conduct and determination to rebuild his life'

Khan's extraordinary journey from the prison cell to the red carpet began 18 months ago when he spoke at an event by JENGbA, an organisation which campaigns against the law of joint enterprise where he met film producer and actress Milica Kastner (pictured left), a high profile supporter of the group and a well-connected socialite, who became his girlfriend

Khan's extraordinary journey from the prison cell to the red carpet began 18 months ago when he spoke at an event by JENGbA, an organisation which campaigns against the law of joint enterprise where he met film producer and actress Milica Kastner (pictured left), a high profile supporter of the group and a well-connected socialite, who became his girlfriend

He was released on parole in 2010 at the age of 23 after High Court judge Mr Justice Ramsey reduced the minimum time he had to serve to six-and-a-half years because of his 'exemplary conduct and determination to rebuild his life.' 

The judge accepted that Khan, who was found guilty at his initial trial of joint enterprise murder, had no idea what his older brother had in mind when they travelled to Callaghan's flat, adding that at the he was an 'immature' 16 year old enmeshed in Nadeem's world of drugs.

Now Khan, who remains on life-long license, which means he can be recalled to prison at any time if he puts a foot wrong, spends his time working with many rich and famous people who have also become his friends.

When asked about his murder conviction, Khan told MailOnline: 'That's correct but I don't want to speak about it at this time.'

A relative at his family home in Rotherham, South Yorkshire said: 'We are very sorry for what happened but Adz has transformed his life and we're proud of him.'

Khan's extraordinary journey from the prison cell to the red carpet began in earnest 18 months ago when he was asked to speak at an event at the House of Commons by JENGbA, an organisation which campaigns against the law of joint enterprise. Whilst there, he met film producer and actress Milica Kastner, a high profile supporter of the group and a well-connected socialite.

By this stage, he had already established his own successful personal training business in Doncaster, called Body Architect but the encounter was to prove pivotal.

By the time he met Milica (centre), Khan had already established his own successful personal training business in Doncaster, called Body Architect but the encounter was to prove pivotal

By the time he met Milica (centre), Khan had already established his own successful personal training business in Doncaster, called Body Architect but the encounter was to prove pivotal

Milica's godparents include Joan Collins (left), Frank Sinatra, Princess Grace Kelly and the late King Hussein of Jordan and her impeccable connections could open new doors for him

Milica's godparents include Joan Collins (left), Frank Sinatra, Princess Grace Kelly and the late King Hussein of Jordan and her impeccable connections could open new doors for him

Milica's godparents include Joan Collins, Frank Sinatra, Princess Grace Kelly and the late King Hussein of Jordan. Her mother is celebrity designer Tessa Kennedy, her late father is Elliot Kastner, a leading American film producer who made the epic 'Where Eagles Dare' and had a legendary reputation for managing big stars such as Clint Eastwood, Marlon Brando and Robert De Niro. Her former husband, Alexander Corcoran comes from a wealthy family with extensive interests in the arts.

Khan and Milica, 47, began dating and she introduced him to her rich and famous friends, giving him unique access to a privileged world and an opportunity to

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