He turned bad after his personal fortune soured. He bought a house from Wayne Gretzky and tried to make money on it during the economic crisis and lost. His investments faltered and he was relegated to living in his car and swindling people.
Not what I expected from him or any other multi-million dollar ballplayer. I have no excuses for his actions, I'm just sad it ended this way because he was a good player. But my opinion may change after the latest steroid accusations against him.