He married the highly regarded and successful Theater Guild actress
Peg Entwistle. They married on April 18, 1927 while she was the female lead
in the Broadway hit, "Tommy". The marriage was a civil affair and took place in the New York City Municipal Building in Manhattan. Actor
Frank Allworth and Keith's mother, Mary D. Robinson, were the witnesses. Entwistle
later achieved her greatest fame posthumously in 1932, when she committed suicide by jumping to her death from the top of the letter "H" in the famous Hollywood Sign.