18 Pa.C.S. § 4301: Bigamy.

(a) Bigamy.--A married person is guilty of bigamy, a misdemeanor of the second degree, if he contracts or purports to contract another marriage, unless at the time of the subsequent marriage:

(1) the actor believes that the prior spouse is dead;

(2) the actor and the prior spouse have been living apart for two consecutive years throughout which the prior spouse was not known by the actor to be alive; or

(3) a court has entered a judgment purporting to terminate or annul any prior disqualifying marriage, and the actor does not know that judgment to be invalid.

(b) Other party to bigamous marriage.--A person is guilty of bigamy if he contracts or purports to contract marriage with another knowing that the other is thereby committing bigamy.