Volksbund had that an Uffz Kurt Grieer (new version of the name, but Gricer seems more plausible) was killed on 21 April 1942 on "Bjelbitzy airfield" (Rjelbitzy in JG 54 loss list), near Solty, Russia.
http://www.volksbund.de/graebersuche...0428EB0284F388
Nothing in Volksbund about a Laurentsch on this date, but remember that the database is not listing all WWII German casualties, so that proves nothing.