When you have successfully hidden a weapon, you are able to make a death attack even while in plain sight of your target.

Prerequisite(s): Dex 15, Quick Draw, death attack and hidden weapons class features, base attack bonus +7

Benefit: If you have hidden a weapon on your person using Sleight of Hand and your opponent believes you are unarmed and weaponless, you may still make a death attack against the opponent if you make the attack in the same round that you draw the weapon. You must still study your opponent prior to attempting the attack.

Normal: Normally a death attack fails if your target is aware of your presence.