Helmer and Sigurdson - Season 7

Gas station attendant Ali Reza is as usual finished at work at midnight, to ride the bus home. In the morning he is found dead under a bridge, stabbed in the back with a knife. Helmer and Sigurdson gets put on the case. Has he been a victim of an internal Pakistani conflict? Who can have motives to stab the gas station attendant in the back?

Helmer and Sigurdson: Season 7 - 1 Episode