For those of you who still haven't got around to watching a film that came out nearly ten years ago, Obadiah Stane is Tony Stark's father's old business partner and Tony's mentor-turned-enemy, who later became the Iron Monger. He was seemingly killed at the end of the film when he fell into an exploding arc reactor.

Is Iron Monger a bad guy?

Obadiah Stane, aka Iron Monger, is a villain in Marvel Comics. Stane is Iron Man's enemy, using the Iron Monger Armor, which is composed of almost all of the features in the Iron Man Armor, but with advanced features and more power. He was also the main villain of much of the late Dennis O'Neil's run on Iron Man.

What happened Iron Monger?

Stane attempts to finally kill Tony Stark Iron Monger was still able to trap Stark on a glass roof and shoot the glass from beneath him. ... As a result, the reactor electrocuted Stane to death. His body proceeded to fall into the reactor, resulting in a massive explosion.