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Please help if you can - a few months ago, at a friend's place, I saw an episode of a series that seemed quite interesting, but I forgot the name of the show. The show is a cop/detective series, about a guy who suffered some kind of trauma (lost his wife? his family?) and has to see a counsellor. Every now and again, he kind of snaps (when he is under a lot of pressure?), and then his personality changes. When this happens, he does things without regard for the consequences and seems to be more brutal and a lot more hardcore.

I don't know if these are enough clues - the show seems to be quite a recent show, I would say in the last couple of years, and I think it is an American show.

Any know-it-all tv series experts out there that can help me out? Please?

It wouldn't be Perception would it?