I'm not sure if it's "technically" a COI- if he couldn't represent anyone locally, it seems like he wouldn't be able to be in both positions at once. I'm sure he has legally worked out how to divide his different responsibilities. Full disclosure: Not a lawyer in any way shape or form. Just voicing my thoughts on this.
He's handled many big cases in the area before, such as defending basketball players with legal issues, but I'm just surprised he is defending someone who is accused of one of the more shocking and publicized crimes in his town. He's lived there for decades and went to school at Illinois- you would think he wouldn't want to have a part in this, even if just for appearances and not because of a COI. It's one thing to defend the star basketball player (even if he was accused of something quite bad), but it seems weird to defend the person accused of kidnapping, and likely more if the FBI's insinuations that she is not alive are correct.