A UCLA grad student has been stabbed to death in a random attack while she was working in a luxury furniture store in Los Angeles. Brianna Kupfer, 24, was alone in the Croft House store on La Brea Avenue in LA's upscale Fairfax neighborhood when a man entered and knifed her. The architectural design student from Pacific Palisades was discovered 20 minutes later by another customer. By the time police arrived at the scene, she was already dead. Police said the male suspect is believed to be homeless and fled through the back door before calming walking down an alley,...