The issue of unauthorized trading and of entering trades in the account of a deceased customer is not a rare violation or an esoteric issue.

FORBES: Trading For The Dead Posed Grave Problem For Stockbroker

When a small plane disappeared off the coast of Chile in September, relatives of one of the 17 crash victims helped locate the plane by signing into the deceased passenger's Find My iPhone account and giving investigators its last GPS position.

FORBES: Magazine Article

Sometimes one spouse may have been using a power of attorney to write checks out of an account of the one who is now deceased.

WSJ: Money Issues of Surviving Spouses