Rule 37.Substitution of Parties: Death, Incapacity, and Transfer of Interest
Part III. Parties · Last amended January 1, 2022 · Last verified September 4, 2026
Full Text of Rule 37
Rule History
Added Aug. 30, 2018, effective Jan. 1, 2019. Amended Aug. 31, 2020, effective Jan. 1, 2021; amended on an emergency basis Aug. 30, 2021, effective Sept. 29, 2021, adopted on a permanent basis effective Jan. 1, 2022.
Plain-English Summary
Rule 37 handles three events that change who the parties are while a case is pending.
Death, and the line the rule draws
If a party dies while a petition for dissolution, legal separation or annulment is pending, the action abates and the court will dismiss the case. There is no substitution and no continuation. The marriage ended by death, so there is nothing left to dissolve.
If a party dies while a petition for paternity or maternity is pending, the action does not necessarily abate, in accordance with A.R.S. section 25-805. The distinction is the point of the rule: a status that survives the party -- parentage, and everything that follows from it -- can still be determined.
Incapacity
On motion or stipulation, the court may continue the action by or against the representative of an incapacitated person or an adult in need of protection. Service is doubled: the motion goes to the parties under Rule 43, and to the incapacitated person's representative in the same manner a summons and pleading are served under Rule 40(f)(1) or Rule 41. A representative being brought into a case gets original-process service, not the lighter treatment given to filings in a case already under way.
Transfer of interest
If a party's interest in property is transferred, the action may simply continue by or against that party. The court may instead -- on motion, or on stipulation of the parties and the transferee -- order the transferee substituted or joined. Again the motion is served on the parties under Rule 43 and on a nonparty transferee in the manner of a summons.
Where the harder cases go
Rule 37 says what happens procedurally. Where a party may be incapacitated and the question is whether protection is needed at all, Rule 37.1 supplies the investigation, the guardian ad litem, and the automatic stay.
Frequently Asked Questions
What happens to a divorce case if one spouse dies?
Rule 37(a)(1) says the action abates and the court will dismiss the case if a party dies while a petition for dissolution, legal separation or annulment is pending.
Does a paternity case end if a party dies?
Not necessarily. Rule 37(a)(2) says the action does not necessarily abate, in accordance with A.R.S. section 25-805.
How is a motion to substitute a representative served?
Rule 37(b) requires service on the parties as provided in Rule 43, and on the incapacitated person's representative in the same manner that a summons and pleading are served under Rule 40(f)(1) or Rule 41.
If property is transferred during the case, must the new owner be added?
Not automatically. Rule 37(c) allows the action to continue by or against the original party unless the court, on motion or on stipulation of the parties and the transferee, orders the transferee substituted or joined.
Which rule applies if a party may be incapacitated but nothing has been decided?
Rule 37.1, which allows appointment of a guardian ad litem to investigate whether the party needs a guardian, a conservator or another protective order, and stays the family law proceeding while that happens.