For a spouse to receive DIC VA Benefits, a service-connected disability or one presumptive of military service must be listed on the death certificate as a primary cause of death or a contributing cause of death.
Be sure the person that will sign the Veteran’s death certificate (at the funeral home or a medical person at a hospital) is aware of any and all service-connected disabilities that could have caused or contributed to the Veteran’s death (Item 35, Part II -n an Death Certificate).
This will help the spouse file a successful claim to receive VA benefits after the Veteran’s death.
https://www.va.gov/disability/dependency-indemnity-compensation/