'Mortally' in the Bible

then ye shall appoint for yourselves cities: cities of refuge shall they be for you; that a manslayer may flee thither, who without intent smiteth a person mortally.

For the children of Israel, and for the stranger, and for the sojourner among them shall these six cities be a refuge, that one who smiteth a person mortally without intent may flee thither.

Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.