User blog comment:Doniko/Headshot - Bioshock 2/@comment-1330314-20100405084153

Oh, well in that case Electro Bolt is what you need. Just zap whomever you want to die and shoot them in the head while they're standing still.

The Crossbow and the Pistol are the weapons you'd want to use at level 15, since they're very accurate. However, once you reach level 18, use the Elephant Gun, since it's a one-shot kill with every headshot.