From Wikipedia (excerpted):

Barbara La Marr (born Reatha Dale Watson...) was an American film actress and screenwriter who appeared in 27 films during her career between 1920 and 1926. La Marr was also noted by the media for her beauty, dubbed as "The Girl Who Is Too Beautiful," as well as her tumultuous personal life. //...La Marr spent her early life in the Pacific Northwest before relocating with her family to California when she was a teenager. After performing in vaudeville and working as a dancer in New York City, she moved to Los Angeles with her second husband and became a screenplay writer for Fox Film, writing several successful films for the company. She finally was "discovered" by Douglas Fairbanks who gave her a prominent role in The Nut (1921), then cast her as Milady de Winter in his production of The Three Musketeers (1921). After two further career-boosting films with director Rex Ingram (his version of The Prisoner of Zenda and the Gothic drama Trifling Women, both with Ramon Novarro), La Marr signed with Arthur H. Sawyer to make several films for various studios, including The Hero (1923), Souls for Sale (1923), and The Shooting of Dan McGrew (1924), the first and last of which she co-wrote. // During her career, La Marr became known as the pre-eminent vamp of the 1920s; she partied and drank heavily, once remarking to the press that she only slept two hours a night. In 1924, her health began to falter after a series of crash diets for comeback roles further affected her lifestyle, leading to her death from pulmonary tuberculosis and nephritis at age 29.

There's much more that's very interesting about Miss La Marr, her life and career, in the complete Wikipedia article; the passages I quoted above are simply the bare basics. For all the fill-in specifics and "juicy details", see the complete article.

Meanwhile...

Barbara La Marr life retrospective video

Tribute video with some additional pictures

Another tribute video

Incidentally, producer Louis B. Mayer, an admirer, subsequently gave Austrian actress Hedwig 'Hedy' Kiesler the name Hedy Lamarr after Barbara La Marr.

Please check out the following list of titles and celebrities I've created TMDb threads for: https://www.themoviedb.org/list/118052