Keith Urban: We Are in 'Deep Grief' over the Death of Nicole Kidman's Father
09/13/2014 AT 01:55 PM EDT
"I'm so very sorry that I cannot perform this weekend. We are in a deep state of grief at the passing of Nic's Father," he Tweeted Friday, following the news that his father-in-law, Dr. Antony Kidman, died suddenly in Singapore the same day.
Urban, 46, was scheduled to perform at the Washington State Fair Saturday, but wrote on Facebook that he and his family are planning to travel back to his native Australia instead.
"[We] are heading to Australia to be with family. We want to thank everyone from the bottom of our hearts for their love, prayers and support through this devastating loss. – KU," he wrote.
According to the Sydney Morning Herald, Dr. Kidman, 75, died suddenly on Friday after suffering a suspected heart attack at a restaurant located inside a Singapore hotel.
The renowned psychologist was reportedly spending time with Nicole's younger sister, Antonia, and her six children in the Asian island country. On Saturday, Antonia was spotted returning to her parents' home in Sydney.
Dr. Kidman was also close to his Oscar-winning daughter. In June, he accompanied both Nicole, 47, and Urban to the Swisse Celebrate Life Ball in Melbourne – and she gushed about his presence there to the Herald.
When asked at the event to name something great in her life, Nicole replied: "My family. My dad's here ... here's my dad," she said with pride, then added: "I've got my men here tonight."