He should have let Deb have Trinity. She deserved one "kill" even though hers would have been metaphorical. Especially this kill, because she was shot and Lundy died because of Trinity.

I thought Rita still had a long way to travel and I'm sorry she's gone.

But when I think of the season as a whole, I'm overwhelmed by Lithgow's creepy performance. No wonder Dexter was off-balance.