(WARNING) The quest "Blood on The Ice" will start automaticly in Windhelm after so many visits. If you are just running in and out of town it can trigger and you can miss it. If you missed it, it will never start for you and (currently) the console fix is not very effective. If you missed it and are determined to get it one way or another, the best solution for an immediate fix is to start over and go to the graveyard everytime that you go to windhelm on the new character. If you succeed there, there's still one more bug to watch out for. When you go to decorate the house, do not buy anything until scrolling to the bottom and buying the clean the murder scene option. If you buy anything, the option to clean the murder scene will disappear and you will have the mess in your house forever.