Green Lantern #54
By Ron Marz and Darryl Banks
This was the moment things started to get grim for Kyle Rayner's Green Lantern. In one of the darkest moves the character had endured in his tenure as Green Lantern, the creative team made a left field diversion and killed off his girlfriend, having her murdered by the brutishly ruthless, Major Force. Not only that but Force left Kyle a note, pretending to be her, telling him to look in the fridge where he had stuffed her corpse.
The move proved controversial and shocking, elevating the issue to the classic standard of milestone, and turning Major Force into a serious villain for Kyle to contend with. The fight that followed was brutal and gratifying, but the events themselves left Kyle feeling broken for months afterwards.
The moment is so shocking that it even warranted an internet debate spearheaded by comic book writer, Gail Simone, in which she commented on the use of females as disposable characters throughout comic book history and labelled the method "The Women in Refrigerators Syndrome".