He was also Director of the Health Psychology Unit at University of

Nicole Kidman's father died of a heart attack inside a Singapore hotel restaurant shortly after completing his morning exercise, according to reports.

The Sydney psychologist is believed to have collapsed when he was inside the Wheelhouse restaurant at the Tanglin Club - a private hotel he had been staying at while visiting his daughter Antonia and six grandchildren during their school holidays.

A doctor and guests at the hotel who were present tried to resuscitate him before paramedics arrived and he was taken to hospital,The Straits Times reported.

Police confirmed that he died at Tan Tock Seng Hospital about 10am and were now investigating the exact cause of death.

A friend of the family earlier confirmed that Dr Kidman, 75, had suffered a fall but did not know any other details.

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Nicole and her father Antony pictured before his death from a fall in a Singapore hotel room accident

Nicole and her father at the Swisse Celebrate Life Ball in Melbourne earlier this year

Nicole's publicist and long-time friend of the Kidmans, Wendy Day, told Daily Mail Australia that the 'family is in shock and is grieving' and is yet to make any statement regarding the well-respected Sydney psychologist's death.

Dr Kidman was visiting his daughter, Antonia, of and his grandchildren who live in Singapore and suffered the fall after eating breakfast.

'The family is in shock and is grieving...I think that some time and privacy is needed to deal with this shock and tragedy,' she said.

She confirmed that Dr Kidman suffered a fall in a hotel room in Singapore, but that was all the information she had to hand.

A similar statement was released by Nicole Kidman's publicist in the U.S. Leslee Dart said: 'Nicole and her family are in shock by the sudden death of her father. She appreciates the outpouring of support and kindly requests privacy during this very difficult time. Thank you.'

A hospital source was reeling from the shock of the news. 'We don't know how to deal with this at the moment or how to digest the fact he's gone,' the source told News Corp Australia.

Dr Kidman was a clinical psychologist at Royal North Shore Hospital and a director of health psychology at the University of Technology Sydney.

He was in Singapore spending time with his youngest daughter, Antonia, who lives in Singapore with husband Craig Marran the managing director of Credit Captial Markets Global Banking.

Nicole Kidman's husband Keith Urban has cancelled his shows to support his wife.

The country star was set to be at Washington State Fair on Saturday but announced on Twitter and Facebook his show has been rescheduled for September 19, 2015.

He also called off his charity performance at Sherwood Country Club in Thousand Oaks, California on Thursday night upon hearing the tragic news, E! News reports.

Urban rushed to be with his wife at their home in Nashville.

Fans were supportive of the announcement as hundreds paid their respects to the grieving family on Urban's Facebook page.

'I am just so sorry about the loss of your father-in-law, being with Nicole and your family during this sad time is where you need to be,' Kimberley Kurtze Hall wrote.

'My condolences to you and Nicole on the death of your father-in-law,' Carol Reis wrote.

'It warms my heart that your family has always come first, and you are definitely where you need to be right now and that is at Nicole's side as well as the rest of the family!! Your loving fans will still be here for you.'

The Tanglin Club, Singapore, where Dr Kidman suffered a heart attack shortly after finishing his morning exercise

UTS Vice-Chancellor Professor Attila Brungs said in a statement that Dr Kidman contributed a lot as a colleague and a researcher during his 43 years of service.

'It is with great sadness that we learn of Dr Tony Kidman's sudden passing. During his 43 years at the University of Technology, Sydney, Tony has contributed greatly – as a colleague, as a researcher, and as a health practitioner,' he said in a statement.

'Tony will be missed by all at UTS. Our thoughts are with his family at this time.'

A spokesperson for the university said the academic community was 'deeply saddened' at the news of his death.

A set visit: Dr Kidman was pictured with his daughter just last month when he came to see her film new movie 'Family Fang' in New York City

'He was much loved by staff and students alike and will be deeply missed,' The Daily Telegraph reported.

The Royal North Shore Hospital was not immediately commenting on Dr Kidman's death, while a woman at the Kidmans' home declined to comment when approached by Daily Mail Australia.

She said she didn't feel 'comfortable' saying anything to the media yet.

A Sydney business owner known to the family, said: 'The Kidman family are regular customers for our shop.'

'With respects to the family, we are not really comfortable with commenting on what has happened to Antony.'

Nicole pictured with her parents at the 59th Golden Globe awards ceremony in 2002

Nicole Kidman's father Dr Antony Kidman has died in Singapore reportedly after falling

Nicole Kidman's father, Antony Kidman, has died in an accident in Singapore

Dr Kidman had been visiting his youngest daughter, Antonia, on a visit to Singapore where she lives

Nicole Kidman with sister, Antonia Kidman-Hawley, at the 74th annual Academy Awards

A police spokesperson told Reuters they were investigating the death as 'unnatural.'

He declined to give details, but the term 'unnatural death' in Singapore often refers to falls or other accidents.

Network Ten reported earlier that Dr Kidman was visiting Nicole's younger sister Antonia who lives in Singapore with her husband Craig Marran and her six children.

As well as his work as a clinical psychologist, he has done research into the psycho-social impact of diseases, including breast cancer.

He also ran community service seminars on aspects of mental health, was a regular speaker on radio and television and wrote for academic journals and the general public.

He was awarded an Order of Australia in 2005 for his contributions to clinical psychology.

The family was last seen together in Sydney back in January for Dr Kidman and his wife, Janelle's 50th wedding anniversary.

In June this year, a beaming Nicole Kidman, 46 walked the red carpet with her father and husband Keith Urban at the Swisse Celebrate Life Ball in Melbourne.

In one of his last public statements, Dr Kidman wrote of the pointless pursuit of happiness.

In the article titled 'Forget happiness, search for meaning', Dr Kidman wrote about the importance of striving for achievable goals in life, with a focus on being contented with what you have rather than on a life of material wealth.

Nicole Kidman was born in Honolulu, Hawaii in 1967, while her parents were studying abroad.

The family moved to Sydney's North Shore when the actress was four.

Close family: The Kidman family stayed very close to one another despite the physical distance between their homes. Dr Kidman is pictured here carrying Nicole's daughter Sunday Rose.

Nicole Kidman and Antony Kidman on her wedding day in 2006 which she celebrated in front of 238 family and friends

Nicole and Keith were married in a traditional Catholic ceremony in Manly on Sydney's northern Beaches

Antonia Kidman, left, with mother Janelle and late father Antony and Nicole

Antonia and Nicole picture with late father Antony Kidman

Antonia Kidman with daughter Lucia, and Nicole Kidman's daughter Isabella

Nicole Kidman has previously been quoted describing her father as a 'great' man that she could rely on at any time of the day.

'He's a great father, I can call him at three in the morning and he's there for me,' she said.

'By the time I was a teenager, I had developed skills as a writer, and my father encouraged me to think about a career in journalism.'

'I began keeping a diary, which I maintain to this day. I used to fill whole notebooks with my writings.'

'My parents thought it was nice to develop my imagination, but they never seriously thought that anything would ever come of it.'

She said her family once told her that she couldn't become an actress because of her height.

'They said that I couldn't be an actress because I would be taller than all my leading men, so I thought I would be a writer instead.'

But despite this she said her parents have always been supportive of her career in acting.

'They allowed me any artistic outlet I wanted.'

'Each weekend I'd go to the theatre at Phillip Street. I used to just lock myself in there for the whole weekend. I thought it was fantastic. I'd be teased a lot though, because I'd be going off to the theatre instead of going to the beach with the boys and all the girls. I felt like an outsider because of that.'

An unknown friend arrives at the Kidman's residence in Greenwich, Sydney, on Friday night

Nicole pictured with husband Keith Urban and their two children, Sunday Rose and Faith