It seems they've found the guy that threw the first beer on Artest.
I saw more of the mess on CNN this morning and noticed something interesting. Check this clip at Cincinnati Black Blog. If you ignore the amusing special effect, you'll see the first guy Artest charged, the guy in the blue smock, just turned Artest's forward motion toward some hapless random individual.
The guy in the blue smock is a cop. Has "POLICE," all caps, printed on his back.