I'm not very handy with links, but yesterday there was a thread detailing all the crazy things Artest has done in his career, starting in like the year 2000. The list was long and detailed, some highlights include choking his girlfriend, getting fined for smashing video eqmt after a loss, multiple suspensions for making obsense gestures and flagrant fouls, and more that I can't remember. And this November he got mad because he asked for time off to pursue a music career & wasn't greeted with enthusiasm.
Honestly, the guy has a long and checkered history. I know that people can change, but the stunt he pulled yesterday doesn't go a long way towards convincing me that he's turned over a new leaf.