State of PA website states in part:

"The Pennsylvania Division of Vital Records maintains records of births and deaths that occurred in Pennsylvania from 1906 to the present."

So, you should be able to order his death certificate.

Division of Vital Records
101 South Mercer Street
PO Box 1528
New Castle, PA 16101
Telephone: 1-877-PA-HEALTH or (724) 656-3100
Facsimile: (724) 652-8951

http://www.dsf.health.state.pa.us/health/cwp/view.asp?a=168&Q=202359

Georgia Walker-Adams