Around the 10:17 mark, I believe that's Margaret Parangosky (if you've read Glasslands). It doesn't appear to be Halsey and she looks about the age that Parangosky is said to be.
No, that's still probably Halsey as Margaret Parangosky is described to an fierce-looking, old woman in her 90's who is fragile and requires a cane to move about. Nothing about that spoiler even hints towards that. =/ Also, Halsey was 61 at the end of Halo 3 & she's no doubtedly older due to the passing years. It's perfectly reasonably for this grey-haired, lab-coated woman to be Dr. Catherine Halsey.
Last edited by KillJoyJoker; September 5th, 2012 at 12:01 AM.