Haven't seen this on the forum, sorry if repeat:
It has a lot of interest for the LR crowd bc it's an ultramarathoner who was also a (likely high-paid) quant.
Be nice, because it sounds like a nice person/family.
You are wondering, OK, what kind of ultrarunner?
I can only find a 50k from 2007:
https://ultrasignup.com/results_participant.aspx?fname=Donny&lname=Fostner
Otherwise no known comorbidities. Sad, and RIP.