I just listened to the controller recordings. My heart goes out to the victims families and the controllers involved. It's a pit of the stomach, sickening feeling listening to the lead up to lost communications. I, too, felt the pilot's voice was a bit shaky/unnerved with the last couple of transmissions.
What I am curious about is the fifteen minutes leading up to the loss of comm. There was no mention of icing by the pilots of several aircraft which made the approach to rwy23. And yet, after loss of comm, some pilots did state icing conditioins between 6000 and 3500 (not exact, my recollection)on the decent.
What a terrible, terrible tragedy. I strongly suspect icing. Where I used to work (retired, now), icing info, when encountered, was spread around to everyone. But then again, I worked in a region where icing was the norm, 9 months out of the year.
I am shaken.
Tom