A Piece for Luck
Thor had to repair his hammer and did so in Pittsburgh's Paretta Steel Mill. Joseph Conroy kept a piece of the uru of the hammer for good luck.
An Accident to be Remembered
Threatening to reveal the criminal actions of Vince Paretta, his boss, Joseph was knocked into a vat of electrified molten steel. The uru's magic turned Joseph into "Living Slag".
Revenge and Death
Seeking revenge for the action, Inferno encountered the Avengers. When Captain America promised that Paretta would be jailed for his actions, Inferno's desire for revenge was sated and he walked into the river, killing himself