Paging CSI. In an incident straight out of the hit television show, a man at the Excalibur hotel in Las Vegas shot a concierge vendor and then himself Friday night. The shooting occurred around 8:30 p.m. in the front lobby of the establishment and left the man dead at the scene, while the woman he shot was pronounced dead at the hospital. Their relationship is unclear. No one else in the crowded lobby was wounded, and the hotel remains open for business.