I was really enjoying Owen's character, such a shame.
Agreed. I didn't like him much at first for whatever reason, but he grew on me. It was pretty obvious that he was going to be killed off in this episode, but I was holding out hope for him surviving as I thought there was still some good material yet to be explored with him. Besides, he was the one Irish character on the show that had a genuine Irish accent (even though he was played by an Englishman). They should have killed off Margaret instead, her accent is terrible.
Rosetti is an odd one. I didn't like his insanity at first as I felt it was too over-the-top, but over time I actually came to enjoy it, especially his rant at God before robbing the church. But in this episode I feel they overplayed it, his violent insanity has become predictable. Oh well, he'll probably be dead soon.