Accidents (Hitman: Absolution)

well, for example, in a mission where you need to protect Ptah from thugs in Chinatown, you can kill one of them practically without doing anything at all, you just need to steal files on Ptah imperceptibly and then the thug will start to hunt, but then ... in general, this is necessary see)

You can still set up sabotage, in the same Chinatown, in the same mission with thugs, spill gasoline, and the victim herself will throw a cigarette butt and voila.
throw off various loads and not only on the head, push into the sewers, poison drugs and coffee with Fugu poison or rat poison.
A lot of options.