Combatposer is a favorite artist of mine, for a long time already.
He uses Poser to create short 3D films of sexy muscular guys getting killed in various ways. You can find many examples on YouTube (they've moved them to the section where you can only see them if you're logged in as 18+ now).
The spanish artist Francisco Goya (1746-1828) made several brutal images, shocked by the atrocities he witnessed during the 1808 uprising and ensuing war. His series 'Disasters of war' wasn't published untik 35 years after he died. Here are a few specimens:
But I think he had a fetish for violence and death anyway, because he also did mythological paintings like this one: Kronos devouring his sons.