You are forbidden to relate information about a person’s past misdeeds or the misdeeds of his family even if you do not intend to belittle him, and you will not cause the listener to think less of him, as he has now corrected his deeds.
This is forbidden because a person is usually embarrassed if his misdeeds are recalled in his presence. Hence, you might ultimately cause him anguish if the information becomes widely known. ~ Guard Your Tongue
Emuna Daily 
Someone asked me a question about someone and I told them that I rather not answer that question. At that very second, I got this email that related exactly to the question. Thank You so very much for the Chizuk.
Wow! Clearly a sign from Heaven that you did the right thing. amazing. Thanks for letting me know.