Yes, the area had been cleaned out and sanitized the day after he passed away. The smell was around for several minutes on Sunday. In the last week, I haven't detected it before or since. The day after he died, I heard the loud thud as if he jumped from his bed onto the floor of his bedroom and then a scratching and clawing on the hallroom carpet in front of my bedroom. It appears that my mind is playing back some of the memories of our cat.