The following footnote appears on page 76 of the LETTERS OF CHARLES DEMUTH, AMERICAN ARTIST, 1883-1935.
Temple Univ. Press, 2000.
"American actress Adele Holladay (or Holliday). the protegee of the actor Otis Skinner and mother of Polly and Louis...Despondent over the breakup of a love affair, her son committed suicide in 1913 with a deliberate drug overdose---in the presence of journalist Dorothy Day and Demuth---at Romany Marie's, another Greenwich Village restaurant."
William Miller in his biography of Dorothy gives a full account of the event as does Agnes Boulton in her memoires. The year, according to Miller, was 1918. This is probably the correct date as Dorothy was born in 1897. "He died in my arms," she said to Agnes Boulton O"Neill. RS