Quite an ending I must say. I watched it again because at first I assumed it was a dream sequence, not so sure now.
SPOILER DON'T READ IF YOU CARE
Really makes it much more difficult to like Dexter as much. He now has the blood of at least 2 innocent people on his hands (Rita and the photographer). His redeeming quality was killing bad people ie. doing what we all wish we could. This is in serious jeopardy.
Also, where does this go in the future? Dexter vs. Deb? How does he get rid of the body etc...