Instead, Tony finished developing a

Instead, Tony finished developing a brand new suit of armor (nicknamed the Silver Centurion) which he had been working on for months, and confronted Stane face to face. Stane used his own suit of armour, which he called the Iron Monger, to battle him in response. Although Stane had layers of ways in which he planned to defeat Stark, Tony overcame each obstacle and managed to send Stane running. As a result, Stane killed himself by removing his helmet, and blowing off his head with a repulsor ray in his suit, as he had finally found a foe whom he couldn't defeat.