Antony Kidman, father of Oscar-winning actress Nicole Kidman, has died in Singapore, police said Friday. Authorities said they are investigating the “unnatural death” of the 80-year-old Australian, who was reportedly in the Asian country visiting his daughter Antonia, who lives there.

Kidman, a clinical psychologist at the University of Technology, Sydney, reportedly died in a Singapore hospital. The term “unnatural death” in Singapore often refers to accidental deaths like a fall.

"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," Vice-Chancellor Professor Attila Brungs said in a statement. "Tony will be missed by all at UTS. Our thoughts are with his family at this time."

Nicole Kidman’s publicist, Wendy Day, said the “family is in shock and is grieving.” Kidman’s husband, country star Keith Urban, canceled a concert he was set to perform in California and jumped on a private jet to the couple’s home in Nashville, TMZ reports.

Antony Kidman walked the red carpet with Nicole and Urban in June at the Swisse Celebrate Life Ball in Melbourne, reports. Kidman, an accomplished psychologist who studied the brain and nervous system for 30 years, was wearing his Order of Australia medal that he was awarded in 2005 for his services to health.

Nicole Kidman was born in Honolulu, Hawaii, in 1967. When she was four, her family moved to Sydney, Australia.

“We were a close-knit family — still are,” Nicole told DuJour magazine last year.