The pacifist achievement text says:
Complete Deus Ex: Human Revolution without anyone dying by your hand. (Boss fights don't count.)
What about me hacking a security system and setting turrets/robots to kill enemies? Does that count as "by my hand"?
On a related note, does knocking and and dropping the guy from the roof in the Rotten Business sidequest count as a kill?
Best Answer
Yes it does count as killing people, according to the sources I have read because you created the death indirectly by your own hand.
The related note you mentioned: If the man you walk up to laying on the ground has a Zzz its a knock-out icon. If he has a skull its a death icon. The environment will always tell you these things. If the roof is such a far drop that you cannot ID him, assume you killed him.