No one can take away an unalienable right. It's not even a feasible scenario. At worst, another can infringe upon an unalienable right.
If I shoot and kill you, I didn't take away your right to life - if I had done that, then no one would care whether or not I had shot you: you wouldn't have the right any more, you see?
Rather what happens is that because I have infringed upon your right to life, my crime is recognized by the society in which I live, and I can reasonably expect retribution.