In 1939, during an all-night jam session, Martha Davis married bass player Calvin Ponder (of Earl Hines Orchestra fame), but they didn't start performing together until 1948. Martha died of cancer in 1960 at the age of 42. Calvin died a decade later at the age of 53.
Goodbye by Martha Davis and Spouse from the 1955 Rhythm and Blues Review
Wild Realm Reviews: Martha Davis & Spouse
Black Cat Rockabilly Europe bio on Martha Davis & Spouse