La. Civ. Code art. 3118
Current with operative changes from the 2024 Third Special Legislative Session
Whenever the umpire has not been appointed by the submission, the arbitrators have the power to appoint him, though such power is not mentioned in the submission. But if the arbitrators can not agree on this election, the umpire shall be appointed ex officio by the judge.
La. C.C. § 3118