This in from the Inyo County Sheriff’s department:
MT. SILL (PALISADES), CA. October 22, 2019 – On October 20 (late afternoon), two hikers/mountaineers were descending the L-shaped snowfield below Mt. Sill when one slipped and tumbled approximately 300-400 feet sustaining unknown but serious injuries. His partner notified the Inyo County Sheriff’s Office through the use of a satellite communication device.
Due to the location and seriousness of the reported injuries, aerial support was requested. Sadly, the patient succumbed to his injuries prior to the arrival of the helicopter. CHP Inland Division Air Operations made an attempt to hoist the fall victim that night but was unable to land due to the high elevation (~13,200′), and gusty north winds.
On October 21, at noon, six Inyo Search and Rescue team members were inserted about 100 feet below the location via Chinook. Team members hoisted the deceased from his location around 2:30pm, and returned to the Bishop Airport where custody was transferred to the Inyo County Coroner 
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Very sad. Particularly this fall after such a heavy previous winter, there are lots of snow fields left. They’re bigger than usual, and harder to avoid. They need to be treated with great respect and only by those proficient with crampons and ice axes. By this time they’re iron-hard and unforgiving of any mistakes.
This is Neil’s mother. Neil had crampons on and was carrying ice axe. He was also trained in ice climbing, arresting fall etc. through courses he had taken.
Did he just slip or did a rock hit him and cause the fall?
My greatest sympathy. I never meant to imply that your son shouldn’t have been there. Mountaineering is a rewarding but risky sport. I’m sorry he can’t enjoy more of it.