well its never happened to me till now

It happened to me with a '65 Coronet 500. When I went to look at it the windows were rolled down. It was warm outside so I didn't think anything of it. After it sat overnight with the windows up I noticed "the smell". I new the previous owner had died because the seller had the power of attorney, but I didn't realize until it sat with the windows up that he had died in the car. Never did get rid of that smell.