Cops released a mug shot of the suspect Tuesday and say Smith should be considered armed and dangerous. LAPD says he's been all over Southern California recently and is likely to be using public transportation.
Brianna, a grad student at UCLA, was murdered Thursday while working at a furniture store in what cops are calling a random daytime attack.
Police say Smith did not know Brianna and they do not have a motive. Cops say the suspect attacked Brianna with a knife and fled the store using the back door.
There's a combined reward of up to $250,000 for information leading to his capture.