From IMDb
Drank herself to death. On May 11, 1941, her last husband, Albert G. Roberts (born 11 October 1902), and his friend found her slumped over the kitchen table dead with her head down on her arms, a cigarette in her mouth, and an empty glass in her hand. 19 days after Shannon's death, Roberts fatally shot himself to death right on the spot where she died.
Became stage actress in New York in 1926.
In 1931, Paramount's Bud Schulberg signed her up to replace the "It" girl, Clara Bow in the movie "Secret Call" after Bow suffered a nervous breakdown.
Was a Ziegfield Girl for a while in the twenties.
Appeared in a Broadway play "Page Miss Glory" which opened November 27th, 1934 as the girlfriend of a then-unknown Jimmy Stewart.