Please mail a copy of the death certificate and a photo copy of their license or ID if you have it to the DMV.  You can mail that to DMV License Production Bureau, P.O. Box 2688 ESP, Albany, NY 12220-0668.  This will prevent further mailings or identity theft.
Can a refund be issues on my mother's registration fee since she just passed?
I would like to get a refund on my mother's registration fee since she just passed, however, I am not the executrix.  Is this still possible?
Unfortunately, no relevant information is found.