Devin was a soldier for the NCR.
Devin was part of a force sent from Camp Forlorn Hope to re-take Nelson from Caesar's Legion. Both of his hands were blown off by a frag mine in the no-mans land near the Abandoned Brotherhood of Steel bunker. He begs for the Courier to euthanize him before he is killed by an additional frag mine. He wrote a letter to his lover Andrew prior to his death, but was never able to mail it.
Devin appears only in Fallout: New Vegas.