The fate of a Mujahir

I need help concerning the fate of a person who exposes his sins whether out of pride or neglect. In an authentic hadith it is said that such a person will not be forgiven. Is this absolute? Can a mujahir still repent before he or she dies as he reaffirm his Iman? Or is it futile meaning there is no hope for such a person despite having Iman?