Following his basketball career, Wintermute worked for Boeing.[1] He was elected to the Oregon Sports Hall of Fame in 1980.[3] On October 21, 1977, Wintermute set out in his yacht from Portage Bay in Seattle's Lake Union and did not return.[5] His boat was found a few days later, with one of Wintermute's friends asleep on the boat who claimed that Slim was still alive when he went to sleep. Wintermute was never found.
