To my knowledge, Richard had never killed a human being.

He'd long ago learned the hard price for killing another human being.

There is always some way to reach out and kill another human being.

She didn't sound upset about having just killed another human being.

It was a terrible thing to kill a human being.

Killing another human being is not something you can forget.

Is it possible to kill a human being by dreaming his death?

Until now, he had never felt capable of killing another human being.

The play points out that killing another human being can never be a moral act.

Going to jail would have been better than killing another human being.