Iron Man's fate varies in different Marvel Comics story arcs. But in certain ones, unfortunately, he does die. It often depends on the creative direction and plot developments.
Iron Man died sacrificing himself to save the universe. He used the power of the Infinity Stones to defeat Thanos, but the energy blast was too much for him to survive.
Iron Man sacrifices himself by using the Infinity Stones to save the universe. The power of the stones is too much for his body to handle, leading to his death.
Iron Man's origin in the comics involves Tony Stark getting captured and using his engineering skills to create the first Iron Man suit to escape. After that, he continued to improve and develop the technology to become the hero we know.