You would likely send it "back" to the custodial service from which it came.
And this hypothetical suicidal person would never know, nor ... depending on the custodial service, ever be owed the funds by the service (e.g., as-is Coinbase's policy).
hmm, you're right.
i guess i wouldn't send it back right away then, and so some sleuthing as to where the funds came from and take it from there.
in this instance i may request some compensation as the whole process would eat up quite a bit of my time...!