5:45PM: I was watching the live Hawk cam earlier this morning and noticed there was only movement from the oldest hatchling. At first I couldn't see the younger hatchling at all. The oldest one was active and I couldn't see whether it was obstructing the view of the youngest one or what.
I noticed last night that the younger one wasn't looking so well (missing throat feathers, not eating much) and I hoped it'd feel better today.
I watched the cam on and off all day today and did see a partial view of the youngest hatchling but it indeed appeared lifeless.
And it seems the third egg is a dud so it is looking like we will have a repeat of last year: Three eggs but only one offspring. Last year there were three eggs but only one hatch.