What odor comes closest to that of the smell of death?

I was just putting the garbage in the container (down in the apartment building) when i thought of this question that has always intrigued me.
What does death smell like?
We always hear from people who have smelled a deceased person that i is a very distinctive odor, one that once smelled you will never forget.
But what comes closest,that you know of, to that actual smell?