Matt Kindt & Keanu Reeves 
BRZRKR #1 [PDF ebook] 

The man known only as Berzerker is half-mortal and half-God, cursed and compelled to violence…even at the sacrifice of his sanity. But after wandering the world for centuries, Berzerker may have finally found a refuge — working for the U.S. government to fight the battles too violent and too dangerous for anyone else. In exchange, Berzerker will be granted the one thing he desires — the truth about his endless blood-soaked existence…and how to end it.