Very sad to hear he's passed away, Went to his slot car business here in Wilkesboro once after moving to Wilkesboro N.C. almost three years ago. Went over there a few months ago to see him but the shop's doors were closed due to Covid 19.
He was battling against either a bad liver or kidneys if i remember correctly, and he went for Dialysis back then, my late wife was going through similar issues. I may be wrong so please don't take this as Gospel truth.

RIP Charlie.