No. Leo Lauterbach didn't die during WWI but escaped from the Russian POW camp in Siberia in rather dramatic fashion. My mother tells me he left Drohobycz as a young man and wasn't close to his family so that may explain why no-one knew what happened to him. My mother never knew about David & Dora's divorce and David's remarriage but maybe that's one of the reasons why he left. I sent some info on to Gideon Goldstein who forwarded it to Bernie for me.