Background: Born Lucille Fay LeSueur in San Antonio, Texas, the youngest and third child of Anna Bell (Johnson) and Thomas E. LeSueur, a laundry laborer. She was of English, French Huguenot, Swedish, and Irish ancestry. Crawford's elder siblings were sister Daisy LeSueur, who died before Lucille's birth, and brother Hal LeSueur. Crawford's father abandoned the family a few months before her birth, reappearing later in 1930 in Abilene, Texas, reportedly working as a construction laborer.
Context: On May 8, 1977, Crawford gave away her beloved Shih Tzu, "Princess Lotus Blossom," being too weak to care for her. Crawford died two days later at her New York apartment of a heart attack. A funeral was held at Campbell Funeral Home, New York, on May 13, 1977. In her will, which was signed on October 28, 1976, Crawford bequeathed to her two youngest children, Cindy and Cathy, $77,500 each from her $2,000,000 estate.  She explicitly disinherited the two eldest, Christina and Christopher: "It is my intention to make no provision herein for my son, Christopher, or my daughter, Christina, for reasons which are well known to them". She also bequeathed nothing to her niece, Joan Lowe (1933-1999; born Joan Crawford LeSueur, the only child of her estranged brother, Hal). Crawford left money to her favorite charities: the U.S.O. of New York, the Motion Picture Home, the American Cancer Society, the Muscular Dystrophy Association, the American Heart Association, and the Wiltwyck School for Boys.  A memorial service was held for Crawford at All Souls' Unitarian Church on Lexington Avenue in New York on May 16, 1977, and was attended by, among others, her old Hollywood friend Myrna Loy. Another memorial service, organized by George Cukor, was held on June 24 in the Samuel Goldwyn Theater at the Academy of Motion Picture Arts and Sciences in Beverly Hills. Crawford was cremated and her ashes were placed in a crypt with her fourth and final husband, Alfred Steele, in Ferncliff Cemetery, Hartsdale, New York.  Joan Crawford's handprints and footprints are immortalized in the forecourt of Grauman's Chinese Theater on Hollywood Boulevard in Hollywood. She has a star on the Hollywood Walk of Fame at 1752 Vine Street for her contributions to the motion picture industry. Playboy listed Crawford as #84 of the "100 Sexiest Women of the 20th century". Crawford was also voted the tenth greatest female star of the classic American cinema by the American Film Institute.
Question: How did she die?. Whats the answer?
of a heart attack.