Though his marriage was already in trouble, he split with Sheila before work one day when he found Karen under the table, giving Ian Gallagher oral sex. Ian and his brother Lip quickly escaped the house but Eddie later showed his anger by attacking their father and telling him to pass the message along. Later on, Eddie find Frank again and apologizes for the attack with the two talking over his failed marriage but his talks about Sheila’s financial benefits cause Frank to visit her.
Eddie appears to be quite religious, which causes his break-down when he learns of Karen's true sexual nature. After leaving his own home, he moves into the basement since he could afford to support his family or live with his brother.
In Casey Casden, Eddie talks with Frank about his relationship with Sheila and says Frank is in for it with Sheilas deviant sexual acts.
Hell bent on revenge after being shown up at a religious parent and child meeting, Karen has sex with Frank and films it as well as posting various other hate filled blogs directed at him. Feeling as though he has failed as a man, Eddie throws himself into frozen water while tied to a cement block. Sheila was left to think he was just missing and spent most of her time looking for him.
When his body is found, Frank is questioned, but later released only to find out his attempts to get Eddie's life insurance had failed as the money had been given to Karen.
Karen later urinates on his grave, as a final revenge for him calling her a whore.