Hilde Warren und der Tod (1917), Erik Lund's Das Herz des Casanova (1919) and Georg Jacoby's Das Paradies im Schnee (1924). Kastner wrote the screenplays for four films that he would produce and star in: Nur ein Diener, Das Herz des Casanova, Der letzte Sonnensohn and Der Weltmeister, all directed by Erik Lund and released in 1919. Kastner's career was almost cut short in 1924 when he was involved in a serious motorcycle accident in Lugano, Switzerland, which left him with permanent pain. He never fully recovered, but after a year of rest and recuperation, he returned to the screen in 1925. Career decline and death By the late 1920s, Kastner's career began to falter. No longer able to play the young, seductive bon vivant type which had made him famous, his roles in films grew smaller, although he still had a measure of success in such films as Karl Grune's 1926 drama Die Brüder Schellenberg with Conrad Veidt, Lil Dagover and Liane Haid and the Jacob Fleck and Luise Fleck-directed Der Orlow with Iván Petrovich and Hans Junkermann in 1927. The onset of sound films proved disastrous to Kastner's career in 1930 upon the release of his first talkie titled Das Land des Lächelns (The Land of Smiles) when filmgoers discovered that he stammered. He would only make one more film, 1930's unsuccessful Tingel-Tangel. After failing to garner any more film roles because of his speech impediment, he tried to revive his career by touring German theatres and permitting female members of the audience to get onstage and have their photograph taken with their past idol. Kastner had depression after his rapid career decline. After two years of struggling to regain his public popularity, he rented a hotel room in Bad Kreuznach and committed suicide by hanging himself in June 1932. He was 42. Personal life Kastner was married to German actress Ida Wüst from 1918 to 1924. The union ended in divorce and produced no offspring. In 1925, he married actress Lisl Tirsch-Kastner. The couple were still married at the time of Kastner's death. Selected filmography The Dancer (1915) The Lost Paradise (1917) Little Angel (1917) Hilde Warren und der Tod (1917) Wedding in the Eccentric Club (1917) The Onyx Head (1917) Five Minutes Too Late (1918) The Last Sun Son (1919) All Souls (1919) The World Champion (1919) The Golden Lie (1919) The Bodega of Los Cuerros