If you would like to authorize someone to collect a death certificate on your behalf, here is a sample template you can use to write an authorization letter for a death certificate.
I am writing this letter to hereby authorize [Person’s Name] to retrieve my [relation]’s death certificate for me. I will be unable to collect it myself due to inevitable circumstances, thus I grant the applicant the authority for the same. I am enclosing all the required documents for the verification process.
Also, I have asked the applicant to carry [his/her] identity proofs for the authentication of [his/her] identity as well. He/She shall seek related details and documents, which I request you to grant him/her unhindered. Your cooperation is requested throughout the process. For any queries, kindly contact me at [Phone No.].