Gregory Dedrick is the Mayor of the Village of Crestwood.
When the Inquisitor arrives at the Village, they persuade the Mayor to allow them access to Caer Bronach in order to drain the reserve and enter Old Crestwood, with the intent of closing the Fade rift which is allowing spirits into the world which in turn are animating the Undead attacking the village. Fearing that evidence would be found exposing his deeds, and unable to bear the sight of Old Crestwood due to his own guilt, the Mayor leaves a note confessing his crimes and flees.
The Inquisition eventually locates and captures Gregory and he is brought to Skyhold to face judgment. Gregory willingly confesses his crimes but states that he only acted because he could not see any alternative in order to save as many lives as he could. The Inquisitor may: