Co-obligor not a party

N.Y. General Obligations Law § 15-102, under Discharge of Joint Obligors.

N.Y. General Obligations Law § 15-102

§ 15-102. Co-obligor not a party. A judgment against one or more of several obligors, or against one or more of joint, or of joint and several obligors shall not discharge a co-obligor who was not a party to the proceeding wherein the judgment was rendered.