Matthew Mellon, the ex-husband of Jimmy Choo guru Tamara Mellon, has died in rehab. He was 53.

Matthew had previously battled an OxyContin addiction where he was spending $100,000 a month and taking about 80 pills a day.

'Billionaire Matthew Mellon, 53, died suddenly in Cancun, Mexico, where he was attending a drug rehabilitation facility,' a rep said in a statement obtained by Page Six.

'Mellon made his fortune in cryptocurrency, turning a $2million investment into $1billion. He is survived by his three children, Force, Olympia and Minty.

'The family asks that their privacy be respected at this very painful time.'

In 2016, Page Six reported that Matthew blamed doctors for his addiction, saying they were 'writing prescriptions like they were Smarties.'

At the time, he was checked into Passages Malibu, an addiction-treatment center popular with boldfaced names, and said that he was determined to battle the addiction, telling Page Six, 'I'm here as long as it takes.'

Matthew had a daughter Araminta, aka Minty, from his marriage to Tamara, and shares a son, Force, and daughter, Olympia, with Nicole.

Matthew is from New York, but grew up in Palm Beach, Florida, and Northeast Harbor, Maine.

Matthew pictured with son, Force Mellon (left), at a Hanley Mellon fashion show in 2015. Tamara pictured with Matthew and her daughter, Minty Mellon, in 2004

Matthew, a graduate of the Wharton School of the University of Pennsylvania, was the chairman of the New York Republican Party's finance committee from 2011 to 2013, during which time he raised funds for the party.

He made his fortune in cryptocurrencies, buying and selling off his Bitcoin a number of years ago, before splashing out $2million to acquire XRP coins, which eventually grew to be worth $1billion.

In February, Matthew told Forbes that he liked XRP, used by currency exchange network Ripple, because it was one of the handful of cryptocurrencies that actually operated within the traditional banking system.

'Crypto is scary and dark. It's anti-America,' Mellon told Forbes, explaining that he chose Ripple because he is 'pro-America, pro-business and pro-bank.'

In 2016, he told Page Six that he developed his $100,000 per month OxyContin addiction after getting hooked on prescriptions given to him by doctors following a surfing injury.

OxyContin, a time-release version of oxycodone, has long been the world's top-selling opioid painkiller and was hailed as a breakthrough treatment for chronic pain when it was approved in late 1995.

Meant to work over 12 hours to maintain a steady level of oxycodone in patients suffering from a wide range of pain ailments, some users quickly discovered they could get a heroin-like high by crushing the pills and snorting or injecting the entire dose at once.