Adding to Olafson's response, pistols don't always kill after a single shot. Damage gets diminished the greater the distance a bullet travels. The instantaneous death of the poor officer was caused because he received a bullet to the head.
We've also made sure that everything that has to do with shooting mechanics, be it the bullet's travel distance, damage dealt, inaccuracy and arching bullet drop are easily adjustable from our side for each and every firearm. We can do changes to this depending on the feedback we receive. I’d say that it would be a good idea to go into a little bit more detail on the shooting mechanics in another developer blog seeing as we have much more control over the system now than when we previously mentioned it in one of our earlier blogs. These improvements to the shooting mechanics were all brought forward due to the feedback we received from players who have direct access to the closed version of the game.