To close a Comcast email account for a deceased person, you need to contact Comcast customer support at (800) XFINITY. Provide them with the necessary documents, such as proof of death and your relationship to the deceased. They will guide you through the process and assist you in closing the account. It's important to have the account details and any relevant information ready when you contact customer support. Remember to be prepared for any additional requirements that Comcast may have in order to verify and process the request.