DeMille married Constance Adams on August 16, 1902 and had one child, Cecilia. The couple adopted Katherine Lester in the early 1920s. She married Anthony Quinn. They also adopted two sons, John and Richard. DeMille suffered a near fatal heart attack in 1956 during the shooting in Egypt of "The Ten Commandments". He never fully recovered. He died on January 21, 1959 of heart failure. He rests in Hollywood Forever Cemetery). At the time of his death, he was planning to direct a movie about space travel. He also wanted to do a movie about the Biblical Book of Revelation.