Thelma's life came to a tragic end on May 11, 1938. She died from a cerebral hemorrhage at the young age of thirty-three. In December of 1937 Thelma had a nervous breakdown and entered Merrill sanitarium in Santa Monica. She would spend her final months in the sanitarium. According to her death certificate she had been a chronic alcoholic since 1932. She was also suffering from pellagra which is a disease caused by a lack of the vitamin niacin. Her body was cremated and a small funeral was held in Los Angeles. Some of Thelma's relatives from Emporia attended the service. Unfortunately her husband Johnny Sinclair did not keep her ashes or have them buried. Today Thelma's remains are at Forest Lawn Memorial Park in Glendale, California. They are being kept in a storage closet in the Great Mausoleum so Thelma has no grave marker.
Thelma's ashes are here