Yeah, from an allergic reaction during his time hospitalized. Not a good way to go, damn.
Tragic...
And here i find myself trying to do something about this happening, i cried all day today, i even donated when he was hospitalized but now all we have of him are good memories of what he did for us and the amazing creativity he let the world see... All hail RWBY, MONTY OUM Rest in Peace! <3