Oklahoma Summons on Third-Party Complaint (AO-441) is a court document issued by the courts in Oklahoma. It is used to notify a third-party defendant of a pending lawsuit involving them. The summons includes the names of the parties involved in the lawsuit, the court where the lawsuit is being held, the title of the lawsuit, and the case number. It also provides the third-party defendant with a deadline to respond to the lawsuit. There are two types of Oklahoma Summons on Third-Party Complaint (AO-441): a Summons in Summons and a Summons in Interpleader. The Summons in Summons is used to notify a third-party defendant of a lawsuit and their obligation to respond to the lawsuit, while the Summons in Interpleader is used to notify the third-party defendant of their right to intervene in the lawsuit.