http://http://tvbythenumbers.zap2it.com/2012/05/13/the-marriage-ref-fear-factor-minute-to-win-it-who-do-you-think-you-are-and-the-sing-off-all-canceled-by-nbc/133914/
I bet it comes back at some point in the future again as the ratings weren't actually that bad for such a cheap show. The current NBC head doesn't like it but he'll likely be fired in a year or two as he's the same idiot that renewed Smash despite it receiving horrible ratings.