This mission unlocks after you take over the outpost Northview Gas Station.
Talk to the mother of the deceased woman. Go to the hill in the east to find the husband of the deceased, standing over the grave (the screenshot). After you are done talking to him, take a few shots around his feet. Around the place, the Rakyata warriors (i.e. your allies) may happen to be. If this happens, start running in the direction of the questgiver. The warriors will be trying to kill you so, do not stop even for a moment. Conversation with the mother will conclude the mission with a success. To soothe the warriors, you need to save, and load the game again. Otherwise, even in the outpost that you have taken over, you may be attacked by your allies.