It's just so sad. The family will be speaking with Allergic Living and giving them more details of what happened. Any reaction can be fatal, even in a hospital setting. There are no guarantees; it's a risk anyone doing a challenge takes. But still... sooooo sad.
And a reminder to NEVER do food challenges at home, especially to a known allergen with reaction history.
My heart breaks for this family. A moderator may want to move this into the Reactions and memorials thread.