Based on your post I was able to obtain the following info at the Vigo County Library.
Ray Sims, who died in August 1944 and Letha Sims Hayhurst are buried in Highland Lawn Cemetery east of Terre Haute.
Letha's husband, Rev. Jesse Hayhurst, who died 20 MAR 1975, was buried in New Harmony Cemetery in southwestern Vigo County. Survivors included: Letha; Joseph Sims, Brownsville,TX; Rosemary Anderson, Terre Haute; a brother William of Terre Haute; a sister, Carrie Belle Garmong, Pontiac, MI.; and two grandchildren.
The book, " Cemeteries of Vigo County Indiana" VOL. 3, c.1982, Pg. 48, lists 15 Hayhursts, including Jesse, who are buried in New Harmony Cemetery.