I don't remember a lot about the movie, well actually a very small part.

Dennis Quaid gets arrested for murder or something along those lines, the prosecutor thinks he is a dirty homeless guy but turns out to be a very rich guy that disappeared longtime ago.

Gang Related (http://en.wikipedia.org/wiki/Gang_Related)

Are you sure? I can't find any movie that he has done called "Reputation"

Where are you getting the title "Reputation" from? The movie is called Gang Related, you can click on the link in my original response to read the plot synopsis.