It was never seen but everyone suspects he killed them both.
That is VERY cold! In fact, that's the reason I miss this show a lot. It's much too graphic to leave turned on with kids hanging around.
And you can't always tell it's coming like you can with most shows, either. When the EMS guys got shot with no warning to the audience, it scared me, then made my stomach turn, THEN it made me mad because my child was nearby and could have seen it. < /rant >