rated "Magnum" episode in over two years, and  prompted CBS to renew the show for a final season even though Tom  Selleck had already committed to three movies (he filmed "Magnum"  episodes during breaks between films). Sinatra, who got along well  with fellow Republican Selleck (who produced the show), agreed to  play Doheny in another episode if the schedules allowed it.  Unfortunately, they didnt.