Well, I'd say that's more of a stench, but yeah, if it smells of death, then you've got anaerobic breakdown (rotting) going on in there. My smell problems have been with the ammonia, it's a bit nitrogen heavy but I don't really want to waste more bedding either, so I'd rather let it be a bit out of balance. And then when it's starting to heat up, my box can put out a bit of a smell. Since I put kitchen waste in there too, there's sometimes some interesting stuff in there. Imagine what a fish carcass smells like when it's been at fridge temps spoiling for a few weeks and then suddenly starts to warm up... I try to bury that kind of stuff a bit deeper in there, but because I'm turning it daily the smells do escape a bit.