Novel Get out of the Novel

Definitely going through this now. I plan everything out months before I write it, but at the end of the season, I am killing a bunch of characters. Most I can make it through but there is this one that is really tough to do. I am very much dreading it. I had all these plans for his future and now he's going to meet such an unfortunate end. It will be for the good of the story but with all he's overcome, it's sad to see him end up like this.