Which wife did John Steinbeck leave widowed at his death?

He was married three times. First, to Carol Henning between 1930 and 1942. Steinbeck was married to his second wife, Gwyndolyn Conger, between 1943 and 1948, during which time he had two sons, Thomas (born 1944) and John (born 1946). He was married to his third wife Elaine Anderson Scott from 1950 until his death.