Creed Richardson left last week on a mission to San Jose, Costa Rica, so he won't be back until the 2014 season.
Jherremya Leuta-Douyere will likely begin his BYU career as a WLB.
Rhett Sandlin will also likely begin as a LB.

The following walk-on LBs are confirmed to be joining the program this fall:
Brayden El-Bakri, Brighton HS, http://m.sltrib.com/sltrib/mobilemobileopinion/53980024-82/lacrosse-brighton-fairman-says.html.csp
Tanner Huber, Del Oro HS, http://auburnjournal.com/detail/199130.html
Ryan Jensen, Alta HS, http://www.deseretnews.com/article/700221015/6-Alta-High-School-players-sign-letters-of-intent-on-national-signing-day-2012.html

The following prior walk-on LBs are returning from missions and may/may not rejoin the team:
Blake McKenzie, Redshirted 2009, Returned in February from California San Jose Mission
Jared Richardson, Redshirted 2009, Recently returned from Mexico Mexico City West Mission
Tanner Zylstra, Redshirted 2008, Returned last September from the Florida Tampa Mission