He knew everyone should know her true identity by now.

Now she knew their identity, and what had happened to them.

He was the only person who knew the boy's identity.

He is probably the only one who knows her true identity.

He did not even know the identity of his parents.

The police did not know the man's identity, officials said.

Even if it was given before she knew his identity.

They know his identity, but have not made it public.

Let him continue to think that I do not know his true identity.

He knew the identity of the man who walked by.