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Grayson Murray is believed to have died after pumping fumes into his garage

Police were called to his hoome in Palm Beach Gardens, Florida, on Saturday

Troubled golfer Grayson Murray died from suspected carbon monoxide poisoning after filling his Florida townhouse with toxic exhaust gases, DailyMail.com can reveal.

The two-time PGA tour winner, 30, is believed to have left his Land Rover running in his ground-floor garage then headed upstairs as it pumped fumes into the three-story property in Palm Beach Gardens.

A worried neighbor heard prolonged, noisy revving at around 12:30am Saturday but when he wandered along the street to investigate it had stopped.

Locals later heard the blare of a carbon monoxide alarm and police were called to the upscale $800,000 home, where Murray lived with his fiancée Christiana Ritchie, 28 at 10:49 am

Grayson Murray is believed to have taken his own life on May 25 after leaving his SUV running in his ground-floor garage then heading upstairs as it pumped fumes into his three-story property

Neighbors who spoke to DailyMail.com said they were awoken by the blare of a carbon monoxide alarm coming from Murray’s Palm Beach Gardens home early Saturday

Murray, who has been open about his battles with alcohol and mental illness, is thought to have been found dead in the upstairs master bedroom. His family have confirmed his death was a suicide.

‘My thought was maybe it was a kid revving a car. I went outside to investigate but by then there was no sound,’ said the neighbor, who asked to remain anonymous.

‘What I later heard is that he started the car in the garage and went upstairs. He went to sleep and never woke up. People only found out because the CO alarm kept going off.’

A spokesman for the Palm Beach Gardens Police Department said there was an ongoing inquiry into Murray’s death.

‘We are conducting an investigation into the matter that occurred in our city,’ he said.

Murray’s death came a day after he unexpectedly pulled out of the second round of the Charles Schwab Challenge in Fort Worth, Texas. He had told his playing partners he was feeling unwell.

‘We have spent the last 24 hours trying to come to terms with the fact that our son is gone,’ his distraught parents, Eric and Terry Murray, said in a statement Sunday.

‘It’s surreal that we not only have to admit it to ourselves, but that we also have to acknowledge it to the world. It’s a nightmare.’

Murray had previously spoken of his battles with depression and rampant alcoholism that saw him drink during tournaments and play while hungover.