False, it was attempted by one of the sorrowful men from Qarth. Another group of assassins who fall a bit below the faceless ones. They generally say something to the effect of "I am sorry" before killing their targets. Thus the name of their group. I can't remember if the girl in the episode did that.
Ah, you're right. Damn you, Martin. Why you gotta name your assassins so closely to each other! Sorrowful ones... faceless ones... What's next?!