The former Atomic Kitten singer's stepfather, Arnold Ferrier, died at the age of 78 on Tuesday morning in Texas after losing a short battle against cancer.
The Iceland ad star is now heading to America, but failed in her bid to be at his bedside when he died.
Kerry's spokesman said, "Kerry was told last week that he had been diagnosed with cancer.
"She received a call (on Tuesday) saying he had taken a turn for the worse.
"She was desperately trying to get over there to be at his bedside."
The spokesman added that Kerry, 27, regarded Ferrier, who was briefly married to her mother during her early childhood in Warrington, Cheshire, North West England, as her real father and remained close to him.
She added: "Kerry and her stepsister, Pat Ferrier, have flown to the US to make the necessary arrangements.
"Kerry is absolutely devastated. He really was the only father that she knew."
Mr Ferrier retired to Texas but split his time between there and Warrington.
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