Yep. Search "Jim Butcher" tar baby and the page is archived on Google Books, fourth result down.
I listened to the audiobook first and found it that way; at first I thought I'd misheard, and went back to it several times. Then I checked in a paper copy and it was right there.
Funny thing? Most white people I've talked to didn't even notice, or at least didn't come to a screeching mental halt over it. If it's brought up, they mumble something about how he probably didn't mean it and it's not such a big deal. Meanwhile, my sister's partner looked like he'd been punched in the stomach when he saw that word on the page. (He's black).