Foul dead animal smell from kenmoore side by side refrigerator/ice maker

There is a foul odor accumulating in the top area of the Kenmore refrigerator & freezer -actually seems worse in freezer area - it's a newer model. There is no food in fridge to account for this. Ice maker has stopped working, but that doesn't seem to be a reason for this terrible cooked broccoli odor, though that's the area that's worst - foul odor from kenmoore side by side refrigerator/freezer/ice maker.....odor is in both refrigerator and the freezer, every item in the unit smells bad.. ice maker stopped working shortly after the smell was detected....cleaned refrigerator and freezer thouroghly and it stills smells awful in fact it smells worse, especially once the doors are opened and closed. I check the back and underneath and there are no dead critters, but yet the whole house smells like something died when you open and close the refrigerator.