for when a man is dead he is free from the claims of sin.

For when you were slaves of sin, you were free as far as uprightness was concerned.

So if she marries another man while her husband is alive, she is called an adulteress, but if her husband dies, she is free from that law, and can marry someone else without being an adulteress.

that creation itself would be set free from its bondage to decay, and have the glorious freedom of the children of God.