Dear Sir or Madam,
You need to file an action/petition with the probate court in the county of the decedent's last residence. A formal probate may not be needed depending on the sixze of the estate, however if formal probate is requied you would have to be appointed PR based upon whether you have preference under law to serve as the PR. Unless you are sole beneficiary, it is likely you will need to hire a lawyer for this process.
The POA is now ineffective as the POA terminates upon the death of your aunt.
Answered on Mar 08th, 2017 at 6:13 AM