Cilla Black died of a stroke after falling over at her Spanish home on Saturday, the coroner has confirmed.
The 72-year-old was sunbathing at her villa in Estepona when she stood up, lost her balance and fell hitting her head, which knocked her unconscious.
She subsequently died of a stroke, and would not have suffered.
The star’s three sons released the information after receiving the “conclusive” results of the autopsy from authorities in Spain.
They have now been given permission to return her body to the UK as soon as possible for her funeral.
“We are devastated by the sad loss of our mother, but have been deeply touched by all the kind messages of support from her friends, fans, the public and media,” said Robert, Ben and Jack Willis in a statement.
“We would like to thank everyone, especially the people of Liverpool. The tributes and condolences have really helped us through these difficult times.
“The Spanish authorities have now told us we are able to bring Mum home, which we hope to do as quickly as possible.
“We would also like to thank all those involved for their assistance with this matter. We respectfully request for our continued privacy to grieve.”
Details of a funeral will be released in due course.