Does Someone Who Committed Zina Need to Confess to Authorities?

Question:

O respected Sheikh—may Allah grant you success—this questioner asks: Whoever commits the major sin of zina (adultery/fornication), is it obligatory upon him to go to the ruler and confess to it, or is repentance sufficient for him?

Answer:

Repentance is sufficient for him, and he should conceal himself, and praise be to Allah.