Letters to the Editor
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seemed clear to me
I didn't find the ending ambiguous at all and I'll bet Chase confirms this in interviews soon: Tony got killed. The music didn't continue over the credits or fade out like in every other episode. It stopped and the screen went black for several seconds and the credits rolled over silence.
We watched the show mostly from Tony's point of view and it ended, as it had to, with his end.
Yes the line about how he wouldn't see it coming was pretty clear foreshadowing. Tony went just like Phil Leotardo did - A gun to the temple that he never saw and shot he never heard or felt.
I don't think Chase was being cute or cruel with his ending. He was just giving us Tony's subjective (non)experience.

