What is the Sharia ruling regarding the inability to return money to a deceased woman who was lied to, and will a person be held accountable for their actions on the Day of Judgment?

Familiarity between young men and women is not permissible due to the sedition and corruption it causes. Your marriage to a woman who denies the existence of God is not valid, as she is an infidel who is not from the People of the Book. It is not permissible for you to lie to her and take her money without her consent, claiming to weaken her for her disbelief. You must return what you took from her if you did not spend it for the purpose for which she gave it, because whoever donates for a specific purpose that is not fulfilled has the right to reclaim their donation. If you cannot return the money now, it is a debt upon you, and you must seek her forgiveness or pay it back when you are able.