Welcome to History Hub
Click on the link below and you will find a form to fill out for a will search in Allegheny County, PA
They require a non-refundable $10.00 search fee
Dear Ms. Zaichenko,
Thank you for posting your request on History Hub!
In addition to the previous poster’s information, we suggest that you review the FamilySearch Research wiki on Allegheny County, Pennsylvania Genealogy. Also, if you do not have a copy already, we suggest requesting a copy of his death certificate from the Pennsylvania Department of Health.
We hope this is helpful. Best of luck with your research!