Cause of death: heart attack
Victor Lonzo Fleming (February 23, 1889 – January 6, 1949) was an American film director, cinematographer, and producer. His most popular films were Gone with the Wind, for which he won an Academy Award for Best Director, and The Wizard of Oz (both 1939). Fleming has those same two films listed in the top 10 of the American Film Institute's 2007 AFI's 100 Years...100 Movies list.
Source : Wikipedia