Florence Cason Crow, widow in 1920

Does anyone know if her husband, William Bonne Crow, was killed in service in WW I?I found his Draft Card C in Ancestry.com.I found him with family in 1910 Census in Waco, TX.In 1920 I find Florence, a widow, with her children in the household of her father, J. F. Cason in Waco, TX.I searched beta.familyserch.org for a TX Death Certificate but did not find one.Does anyone know the answer?Bickie