The LA Times is reporting the cause of death of the hikers found dead in Desolation Wilderness. The first man, Thomas A. Hylton died of a heart attack. He apparently fell ill during dinner at their campsite, just 2 miles from the trail head at highway 89. Unfortunately , Hylton was the more experienced of the two. The other man, Jerome B. Smith apparently left immediately to find help, wearing only a flannel shirt. The moon was just a sliver that night and he fell down a rocky slope, suffering moderate injuries. The night time temperature at that altitude was probably in the 20s and he died of exposure sometime during the night.
There you have it.
RIP Mr. Hylton & Mr. Smith.