A post-mortem examination is due to be carried out on British TV presenter Cilla Black today.
The death of the 72-year-old former pop star and television presenter, who lived in Estepona on the Costa del Sol, Spain was announced yesterday.
A Spanish police spokeswoman said: "We are still awaiting autopsy results but everything at this stage is pointing towards her death being the result of natural causes."
Former Beatle Paul McCartney, who is in Los Angeles, said: "Such a shock to hear about Cilla's passing. She was a lovely girl who infected everyone with her great spirit.
"From first meeting her as a cloakroom girl at the Cavern in Liverpool, to seeing her many times since, she always had a fun loving dignity that made her a great pleasure to be around.
"She had a fine distinctive voice and was always a bit of a laugh. It was a privilege to know and love her."
Former Beatles drummer Ringo Starr said: "I just heard the news Cilla Black has left us she was a good friend we will all miss her peace to Cilla peace and love to the family R&B xxx."
Born Priscilla Maria Veronica White in Liverpool, Ms Black had spoken of how she would die happy if she were to pass away before any illness could rob her of being able to enjoy life.
As she approached her 71st birthday last year, she said that 75 might be a good age to die.
She became one of the UK's favourite entertainers after transforming herself from a successful singer in the 1960s to the front woman on shows such as "Blind Date" and "Surprise! Surprise!"
An associate of The Beatles and their manager Brian Epstein in the early 1960s, she scored two number ones in 1964 - 'Anyone Who Had A Heart' and 'You're My World' - as well as enjoying many other hits, before going on to concentrate on TV.
She went on to host more than 500 editions of her programmes and was the first woman to have her own prime-time chat show on BBC1.
Singer Sir Cliff Richard said he will miss his "outrageous" friend dearly who was "full of heart".
Fellow presenter Christopher Biggins, who starred alongside Cilla in "Surprise! Surprise!", said: "She was a wonderful friend. She was someone who was a life force, she loved to laugh and loved to enjoy herself.
"She will always be with me. She was a national treasure."
He said that Ms Black was loved by everyone and had the "common touch".
The life of the entertainer was portrayed in an ITV biopic last year, which followed the story of the typist's rise to fame.
Ms Black's publicist Nick Fiveash said details of her death would be announced following a coroner's report.
