Ariz. Rev. Stat. § 23-1023
B. If the employee who is entitled to compensation under this chapter or the employee's dependents do not pursue a remedy pursuant to this section against the other person by instituting an action within one year after the cause of action accrues, or if after instituting the action, the employee or the employee's dependents fail to fully prosecute the claim and the action is dismissed, the claim against the other person is deemed assigned to the insurance carrier or self-insured employer and all of the following apply: