The only central repository for that information that I am aware of is the Social Security Death Master File, which is updated monthly. You can't access the list directly through SSA, but here is their
fact page that directs users to the official distributor of the list.
A number of consumer reporting agencies and id verification services used for CIP also subscribe to the list, so if you have a vendor that you use for non-documentary customer verification, you may want to see if they can facilitate DMF inquiries.