You make an interesting point. Both of these legends were known for their their wit - their voices - and the laughter they generated (topics and targets notwithstanding).
Robin Williams death was from asphyxia - he choked his own throat; Joan Rivers went in for a throat/vocal chord procedure and never came back.
Something about the land being made desolate, the ceasing of the voice of mirth, the voice of gladness...>>>
Mirth ceasing, from sea to shining sea... California to New York... Woe indeed!
From the goyim of California to the Jews of New York Island... this land...
Ooops.