Yes death certificate is a public document which can be obtained by anyone making an application in the prescribed format laong with prescribed fees. I am not aware that death certificates are issued by panchayat any more. But if so is the case then you can approach the concerned panchayat and get the certificate. In case you need any help in this matter you may contact me on 9013429126.
You can make an application for a copy at the most they will ask you for an affidavit
your wife can get copy of death certificate from that municipal corporation office. For any further assistance, feel free to contact me on my e-mail "firstname.lastname@example.org"
Shubham Pabbi & Associates