Given the time of year, they are likely in dormancy. Sarracenia pitchers will die back, especially in winter, and one of the tricks Sarracenia uses is that they will more or less cannibalize their traps once they have outlived their usefulness to reclaim the water and nutrients.

In short, shouldn't be too worried, as long as it's still growing -- or at least, starts growing again in once dormancy ends... Do you happen to have a digital camera?

Yup, totally normal HOWEVER, it should have been in total dormancy until about this time of year. These are NOT inside plants.