Keith Urban and wife Nicole Kidman are currently in grief after the actress' father suddenly passed away on Friday in Singapore.

The family of the award-winning actress is in deep sorrow as Dr. Antony Kidman died from an apparent heart attack. Earlier reports have claimed that the award-winning actress' father suffered from a heart attack at a restaurant inside the hotel. The Australian psychologist was actually joined with Nicole's younger sister, Antonia and her six kids in the said Singapore trip.

With the sudden loss, Keith Urban, who is currently lined up to perform in a series of shows has already apologized to his supporters as he may not be able to perform. In his recent announcement, the country singer tweeted about not being able to perform after the news of his father-in-law's sudden death came out.

"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.

 Instead of pursuing his scheduled activities, Nicole's husband opted to travel back with the actress to their native Australia with a devastated heart. The 46 year-old singer was supposed to appear in the Washington State Fair on Saturday; however, his appearance has been canceled after the loss of his father-in-law.  Keith Urban was also reported to be a very emotionally supportive husband over his wife filled with grief.

Dr. Kidman's death has definitely caused so much grief to his family including to his actress daughter who is reportedly close to him. According to People.com, the doctor previously accompanied his daughter and Keith Urban just last June during the Swisse Celebrate Life Ball in Melbourne. Nicole even reportedly gushed about her father's presence during the event when she was asked about something great in her life at that time.