So early on in my current save I had a meet up with the vault tech rep. After hearing his story I did my best to put on the happy face and told him he could go back to Sanctuary. That was over 5 days of game play ago and only after learning he can become a special merchant I started to wonder what happened to him. I returned to Sanctuary but he wasn't to be found. I ended up checking all of my settlements and he wasn't at any. After dealing with Doc Anderson I figured he was just lost in the world and I was going to use console commands to summon him but first I wanted to finish my bobblehead collection so I fast traveled to the Mass Fuzion building. I couldn't believe it as the first thing I saw was the dead body of that vault rep. For those that don't know that fast travel point is a stones throw from the front door of Good Neighbor. The poor chap survived a nuclear war and the 200+ years of hell that followed only to get gunned down no more than 50 feet out the door after a promise of some peace of mind from ghosts of the past. I am not even sure what would have killed him at that spot it must have just been some horrible timing on his part.