found:Wikipedia, viewed March 11, 2019:Rex Mays (Rex Houston Mays, Jr. (March 10, 1913 - November 6, 1949) was a former AAA Championship Car race driver ... Born ... in Riverside, California. ... He was killed at the age of 36 in a crash during the only Champ Car race held at Del Mar Fairgrounds race track in Del Mar, California.) -https://en.wikipedia.org/wiki/Rex_Mays