Abonner for at downloade
Everyone Can Die! v1.1 (Kill Essential NPC's)

This mod is as it states, it allows you to kill everyone. However, at it's current state almost everyone can be killed. Some people cannot be killed due to the fact of the how they are marked. I will try to fix the issue but as it is right now, a vast majority can be killed. Also Some people cannot be killed due to them being linked to a specific quest.

If you want to know which ones are visit:
http://www.uesp.net/wiki/Skyrim:Essential_NPCs

Given Credit for compling the list of essential NPC's.

Currently only works with vanilla npcs.

WARNING: KILLING A QUEST NPC WILL RESULT IN THE QUEST FAILURE FOR SOME QUESTS OR THE QUEST WILL NOT BE ABLE TO BE COMPLETED.

P.S: If a mod already exists like this, I didn't know at the time of the creation. Also, if you find one that I have missed please leave name in comments and I will try to fix it.

Update v1.1 (9/17/2014)
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-Fixed problem with some NPC's Not being able to be killed.

NOTICE
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I Haven't had time to update the mod due to life in general and it is actually obselete at this stage as there is something you can put in the ini file to disable essential (except for children of course.)

Link to how to do so
https://www.nexusmods.com/skyrim/mods/33929/