It's possible that:
* The name is misspelled: Double-check the spelling. Are you sure it's "Vierlingh"?
* It's a local or family name: The name may be specific to a particular region or family.
* The individual is not publicly documented: If the person was not a prominent figure, their death date might not be publicly available.
To help me find information, could you please provide more context?
For example:
* Where did they live?
* What was their occupation?
* Are there any other details you know about them?
With more information, I might be able to help you find the date of their death.