Denial of petition for writ of mandate challenging decision of respondent-hospital's hearing officer to deny plaintiff staff privileges is reversed, with directions, where the decision to prematurely terminate the hearing should have been made by the trier of fact and not the hearing officer. Reversal is made over respondents' claims that: 1) the court of appeal should ignore the action taken by the hearing officer and address only the final action taken by the governing board; 2) the premature termination of the hearing was warranted as the decision served the interests of the peer review process; 3) the hearing officer is disqualified from serving in such capacity; and 4)appellant is entitled to injunctive relief that reinstates his privileges until and if it has been determined in a peer review proceeding that his privileges were properly terminated. (Opinion following rehearing).