Season 10: Jimmy Evans
Alex's father, Jimmy Evans (James Remar), checks into the hospital after getting in a car crash with his buddies. Alex and his dad don't have the greatest relationship, since he was abusive to Alex and his mother. When Jimmy checks into the hospital again to get clean from heroin, he collapses then goes in surgery with Shane the resident. Alex isn't able to mend his relationship with his father, who hallucinates about his new family when he wakes up, only to eventually die. It's a pretty rough storyline that makes you hurt for Alex.