What is the ruling on the money I collected through deception, under the pretext of donating to a woman undergoing kidney dialysis, and then disposed of it, knowing that I am able to repay the amount? And does the ruling differ if the woman has passed away?

If you collected donations for a person, you are their agent. If you spent the donations inappropriately, you have combined lying with breaching the agency agreement, and you must repent for both.

Regarding the absolution for the expenditure of donations: - If the woman is still alive, you must pay the money to her. - If she has passed away: - If the donors intended absolute charity for her, the money is hers and transfers to her heirs, and you must pay it to them. - If the donors intended to contribute to her treatment, or did not intend anything specific, you must return the donations to the donors. For anyone you are unable to return it to, you should give its value in charity on their behalf.