Superman in Action Comics #734

Superman faces a personal crisis when he discovers his adoptive father Jonathan Kent has suffered a fatal heart attack. As Clark races home to Smallville, he must confront the harsh reality that for all his incredible powers, he cannot save the one man who taught him what it truly means to be a hero. This deeply emotional issue by Joe Kelly and various artists marks a turning point in the Man of Steel's life as he grapples with loss and mortality.