A British hospital that fell victim to a hoax call from two Australian DJs seeking information about the pregnant Duchess of Cambridge has protested to the head of the radio station's parent company.

Southern Cross Austereo CEO Rhys Holleran talks to the media during a press conference (Robert Cianflone/Getty Images)

The protest letter came after a nurse who took the hoax call was found dead early Friday, three days after the incident made international headlines.

Lord Glenarthur, the chairman of King Edward VII's Hospital, wrote Max Moore-Wilton, chairman of Southern Cross Austereo, to urge him to ensure the incident will not be repeated.

He condemned the prank for "humiliating two dedicated and caring nurses," saying the consequences were "tragic beyond words."

Jacintha Saldanha's death is being treated as unexplained. She transferred the prank call to a fellow nurse caring for the former Kate Middleton.

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