The music was composed by Rolfe Kent for the show. There's a Dexter soundtrack, you can d/load it. And by the way I have saw both seasons of Dex and its amazing! Advise everyone to watch it!
hi timmy-92,
sorry i got it wrong the other day, i know the song you mean, its by the rolling stones and i will get you the name asap. i thought it was the tune FX were using but it aint!