Mill Street Bistro in Norwalk, Ohio, which was featured on season six of Kitchen Nightmares has closed. The restaurant changed its name to Maple City Tavern after the show aired and suffered from bad reviews on Yelp and Tripadvisor, many of which complained about the owner
The Norwalk Reflector reported that the building that the restaurant was in sold for $140,000.
A separate article on Norwalk Reflector interviewed owner Joe Nagy and he says he has no regrets about doing the show and that he is still involved in other food-related businesses.
In January 2014, Gordon Ramsay allegedly settled a dispute between himself and Joe Nagy over a box of missing meat, damaged ceiling tiles, and a missing cooking pot (Link).
This will be the fifth restaurant from season six of Kitchen Nightmares to close and the Kitchen Nightmares Updates Page has been updated with this information.