I thought you might be interested in the results of my research.
As it turns out, both Reuben and Leagrem are survived - so to speak - by family. Even if they're already aware of the lost soldier's fate, visiting one of them may prove a worthy venture.
You can find Reuben's ex-wife, Joanna Whitehall, in the Undercity's War Quarter, where she spends most of her time. I'm unsure how receptive she'll be to the news, mind.
As for Leagrem, his aunt became the Orphanage Matron in Stormwind, an admirable position to hold.
No matter your path in life, I wish you the best of luck in your endeavors.