Comic book deaths can be heroic or brutal but they are not always final. If the storyline demands it or the timing is right, characters regularly come back to life. As Professor X of the X-Men pointed out, "There are no pearly gates, but instead revolving doors." Although he was talking about Krakoan resurrection at the time, this has been true for popular Marvel Comics characters for decades. However, fridging is the most heinous form of death in comic books, and often its most permanent. Treated as tragic deaths, fridgings provide the motivation to break heroes out of their shells and grow as characters. In reality, though, they perpetuate a storytelling trope that enables the victimization of female romantic interests.
Source：https://www.cbr.com/history-fridging-killing-women-marvel-comics/
