 NPR's Ayanna Archie reports that there's been no official public statement on the cause of those deaths. Authorities are still investigating the recent deaths, the most recent on Sunday, when a 50-year-old from San Angelo, Texas, was found unresponsive on the Bright Angel Trail. Last month, Scott Sims from Austin was found semi-conscious on the River Trail. About two weeks earlier, a 41-year-old man was found unconscious on Bright Angel Trail.