You'll meet him first when you find out what happened to Jeremy.
How do I find out what happened to Jeremy?
Durkin refuses to believe that you can identify the body they found here. You need to give him some real proof.
Did you notice the pile of photographs in Jeremy's apartment? They're on a table next to the door.
After you talk to Durkin the first time, Jeremy will now let you take that photo. Bring it back to High Line and show it to Durkin.
Well, I wouldn't call that trust, but at least you now have his number, and he believes you're not just some lunatic.
When should I contact him?