I have just watched the most recent episode of series 4.
I thought I had sorted out all my moody looking male characters with short hair and was getting a bit of a grip on it.
Soooooooo.......who on earth is Tommy???
Tommy was a gangster and informer used by Henrik. He was executed. Google The Bridge Series 4 episode 5 - it's all summarised there on Wiki. Don't do what I did though and read on further than you need or it will spoil things for you.
I have watch the Bridge for a long time but glad I'm not the only one to be confused this time. Too many different people who look alike. Think this is the last series.