The Chicago Code. From Shawn Ryan, the guy who brought you "Terriers". Canceled after just one season due to poor following. Fantastic show though, from the first episode to the last. Also, a lot of great acting. Luckily, they wrapped up the bulk of the storyline by seasons end, you'll want more, but it won't leave you hanging.
Fox actually loved the show, it just didn't get the audience it deserved. You can watch it on Netflix. I highly recommend you do.