How Did The Man Die?

A tall man is laying face-down in the middle of a desert. He is dead. Laying in front of him is a rock, a buzzard, and a cactus. The man has no cuts, bruises, or any type of bodily damage whatsoever. He did not die of dehydration, nor has he had a stroke, heart attack, etc. Who is this man, and how did he perish?

::: spoiler Answer The dead person was Superman, and the rock, Kryptonite, killed him. :::