The killer may have acted alone, but he was not some poor immigrant from Russia operating in a vacuum.

They believe it is more likely that her killer acted alone.

The killer neither sounded nor acted old enough to be retired.

The police said there was no evidence to indicate that their killers had acted out of religious hatred.

It was strongly suspected that the king's killers had acted on instructions from Richard.

Mr. Pierce said the killer may have acted on impulse.

In either case, the killer is acting as an evangelist of anarchy.

If I calculate accurately, we have eleven or twelve days before the killer acts again.

The killer is acting in a way that no one can forgive.

The killer, he surmised, "was acting as a result of evil in his heart.