a power of attorney ceases upon death. If an estate has been opened, the personal representative would have power to check on some things, such as bank accounts, brokerage accounts, etc.. If an estate has not been opened, it should be opened if there are any assets. Good luck.
I am not really sure what you mean by "checked out". A Power of Attorney is only valid while a person is living. If you discover that your mother's ex acted improperly, you should meditatively contact an estate attorney to discuss your options.
Since your mother is deceased, the Power is no longer valid. Your mother's estate should go through Probate. I recommend contacting a local Probate attorney to assist you if you are named the Personal Representative.
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The power of attorney was void upon death as explained in previous answers.
The best way to proceed would be to open an estate and the PR would have all the financial
records or could obtalin them for examination of wrong doing.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.