[winfrey1000]

How do I locate a deceased person if the case may be of unknown origin as to whether this person has a policy that is unknown to his survivors.

[smoothy]

What relation are you to the deceased? The Executor to the estate has access to all of their records.

[Fr_Chuck]

You look though all of their records, check bank payments to insurance companies,
You look for bills or statements in the mail for the next year or two.

[JenSCDC]

The NAIC -National Association of Insurance Commissioners, the state officials who regulate the insurance industry- has a page on how to do this: Consumer Alert: Finding A Lost Insurance Policy