You can use a statement of death or a death certificate as proof of death.
The statement of death is sufficient in most situations to notify the federal government of a death.
A statement of death is issued by the funeral home.
A death certificate is issued by the province or territory where the death occurred.
If the person died outside of Canada, follow the instructions to report a death abroad.
More information: Death abroad
You may need the Social Insurance Number (SIN) of the deceased person to report the death to the federal government.