Did a large rock outcrop fall in Yosemite one night around 1990, killing a camper in a tent?”
Not in 1990, but 1996 at 6:52 PDT (apparently AM). Search the provided link for “Happy Isles”. The article does not mention that the valley was filled with dust and people had to be evacuated. The last time I was there the damage was still visible. Further information is available if you search news archives from Google News for [Yosemite rockfall] for the year 1996. All the ones I found required payment to view.
