When a vacancy occurs in the board of managers selected by the house to try impeachment proceedings before the senate, and the house of representatives is not in session, the speaker or the presiding member, or if there is no presiding member, then the oldest member of the house in point of age, shall appoint a member of the house to fill the vacancy.
A.R.S. § 38-319
Vacancy in board of managers
Official source: Arizona State Legislature. Reproduced from public-domain Arizona statutes; confirm against the official source for the current text. Not legal advice.