It said she "had been in excellent physical health for her age, until recently contracting a serious case of pneumonia," Fox News reported.
"She was surrounded by close friends," the statement added.
Her velvety voice, wholesome blond looks and ultra-bright smile brought Day a string of hits, first on records and later in Hollywood. With her film dramas, musicals and innocent sex comedies, Day soon became America's box-office sweetheart of the 1950s and 1960s.
Born Doris Mary Ann von Kappelhoff on April 3, 1922, in Cincinnati, she was named in honour of Doris Kenyon, a silent screen star.
Day married four times and had a child before she was 20, CNN reported.
She described her first husband as a "psychopathic sadist" who beat her. Her second husband told her by letter that he was leaving her after eight months. Husband No. 3 was agent Martin Melcher, who mismanaged her fortune and left her in debt when he died. Her fourth, restaurateur Barry Comden, complained to the press that she kicked him out of bed for her pets.
Among her other well-known songs were 'Secret Love' and 'Everybody Loves a Lover.'
Among her most popular films were three romantic comedies she did with Rock Hudson: 'Pillow Talk' 1959, which brought her an Academy Award nomination for Best Actress, 'Lover Come Back' 1961 and "Send Me No Flowers" (1964).
She also starred in several beloved musicals, including 1953's 'Calamity Jane' and 1957's 'The Pajama Game' as well as comedies like 1960's 'Please Don't Eat the Daisies' and the drama 'Midnight Lace,' also from 1960.
Her last film, 'With Six You Get Eggroll,' was released in 1968.
Day had one child, Terry Melcher, whose biological father was Jorden but who was adopted by Melcher.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)