An Australian radio network at the heart of a hoax targeting Prince William's pregnant wife canceled the show responsible for the prank on Monday, expressing deep regret for the death of a nurse who took a call from the DJs involved.

The two DJs "will not return to the airwaves until further notice," the statement from the network, Southern Cross Austereo, said. The company also suspended all prank calls, pulled advertising and ordered a comprehensive review of relevant policies and processes.

The DJs, Mel Greig and Michael Christian, who were impersonating Queen Elizabeth and Prince Charles, called the hospital Tuesday and gained some information about the condition of Catherine, Duchess of Cambridge -- which they subsequently played on air.

On Friday, the nurse who transferred the call through to the ward, Jacintha Saldanha, was found dead after apparently committing suicide.

"First and foremost we would like to express our deep and sincere condolences to the family ... for their loss. We are very sorry for what has happened," Rhys Holleran, the network's chief executive officer, said in Monday's statement.

"We don't claim to be perfect and we always strive to do better. We have initiated a detailed and rigorous review of our policies and procedures to inform any improvements we can make."

Greig and Christian also apologized in interviews with the Australian TV shows "A Current Affair" and "Today Tonight" on Monday.

"There is nothing that can make me feel worse than what I feel right now," Greig said on "Today Tonight."

Christian told "A Current Affair" the prank had become "a tragic turn of events that I don't think anyone could have predicted or expected."

"I'm still trying to make sense of it all," he said, offering "our deepest sympathies" to Saldanha's family.

London's Metropolitan Police have contacted Australian authorities in relation to the call, but "are not discussing about what or with who" they're talking, a spokesman told CNN.

A spokeswoman for New South Wales Police in Australia told CNN: "As the investigation into the death of London nurse Jacintha Saldhana continues, New South Wales Police will be providing London's Metropolitan Police with whatever assistance they require."

Ben Barboza, Saldanha's husband, expressed grief over his wife's death in a post on Facebook: "I am devastated with the tragic loss of my beloved wife Jacintha in tragic circumstances, She will be laid to rest in Shirva, India."

Saldanha's daughter posted a photo of herself with her mother and wrote: "I miss you, I loveeee you. Jacintha saldanha."

The chairman of the hospital where the pregnant Duchess of Cambridge was a patient slammed the Australian radio station's decision to broadcast the recorded prank call as "truly appalling" on Saturday,

"King Edward VII's Hospital cares for sick people, and it was extremely foolish of your presenters even to consider trying to lie their way through to one of our patients, let alone actually make the call," wrote the chairman, Simon Glenarthur.

"The immediate consequence of these premeditated and ill-considered actions was the humiliation of two dedicated and caring nurses who were simply doing their job tending to their patients.

"The longer term consequence has been reported around the world and is, frankly, tragic beyond words."

Glenarthur called on the radio station to take steps "to ensure that such an incident could never be repeated."

The Australian Communications and Media Authority, the country's media regulator, has not yet commented on the case.