I've just found that Dick Dolack, a field judge (now back judge) from 1966-1990, died on December 29, 2018 at the age of 84. Dolack wore no. 31 for the majority of his career and he worked in Super Bowl IX (after the 1974 season) and 5 Conference Championship Games (NFC 1975, NFC 1977, NFC 1979, AFC 1980 and AFC 1987, in this last game he got injured and was replaced by ALT Jerry Seeman).