Who Was It Who Said...?

The line "Death ends a life, not a relationship" is quoted on several websites with attribution to Robert Benchley, but none, at least not any of the sites that I visited, offer any verification (such as when and where was it uttered or printed). In fact, the various websites all seem to be simply swiping it from each other with no attempt to verify. So, my question is: Does anyone have, or care to at least attempt to find, a source for the line?