A.M.
This happened to me when I lived in Georgia- there was a horrible smell in the kitchen- it smelled like rotten chicken or something dead- after several miserable days, my dad suggested looking underneath the fridge for a pan that collects water- sure enough, I pulled it out and OMG! Bleh! It was horrible, there was all sorts of fuzzy mold and yucky stuff floating in the water- apparently the fan that is suppose to evaporate the water quit working so it just piled up and got gross- I dumped it out and soaked the pan in bleach for about an hour and then rinsed it off and put it back and no more stinky kitchen.