25 Pa. Stat. § 2940
In case of the death or withdrawal of any candidate nominated by any political body by nomination papers, the committee named in the original nomination papers may nominate a substitute in his place by filing in the proper office a substituted nomination certificate, which shall set forth the facts of the appointment and powers of the committee (naming all its members), of the death or withdrawal of the candidate and of the action of the committee thereon, giving the name, residence and occupation of the candidate substituted thereby, and the truth of these facts shall be verified by the affidavit annexed to the certificate of at least two members of the committee. In the case of a vacancy caused by the death of any candidate, said substituted nomination certificate shall be accompanied by a death certificate, properly certified: Provided, however, That no substitute nomination certificate shall nominate any person who was a candidate for nomination by any political party for any office to be filled at the ensuing November election, whether or not nominated for such office by such political party, or who has already been nominated by any other political body for any office to be filled at the ensuing November or special election.
25 P.S. § 2940