I want a game that i can knife people in or stealthily kill them

[Dragonos]

be a witch in MW2! (marathon + lightweight + commando + tactical knife) though thats not so much stealth though, its more like inspector gadget on meth shanking people...

hitmans' another game that comes to mind, though i havent played any of the recent ones (last time was ~4 years ago? probably more)