LILBURN — Authorities say a Wal-Mart worker was shot and killed by a suspected shoplifter at a store northeast of Atlanta.CBS 46 reports that the loss prevention officer was gunned down shortly after 9 p.m. Sunday at the Wal-Mart on Lawrenceville Highway in Lilburn.Lilburn Police Capt. Thomas Bardugon tells The Atlanta Journal-Constitution that workers confronted the suspect as he headed toward the parking lot, and a struggle ensued.