What is the ruling on one who was given the choice between eating repulsive, spoiled food that even animals wouldn't consume, or dying of starvation, and chose to die of starvation, and then died? And is he considered a killer of himself?

The one in dire necessity must eat from forbidden and repulsive things to stave off death, except for what is harmful like poison. If he refrains and dies of hunger, he would be a killer of himself and would enter the Fire. The jurists have stipulated the obligation for the one in dire necessity to eat excrement and blood.