The mysteries surrounding Joan Rivers’ death continue to deepen. On Tuesday, news outlets such as Fox News, reported that Rivers’ final vocal recording existed on, of all things, a YouTube video promoting the play “My Son the Waiter, a Jewish Tragedy,” starring Brad Zimmerman.

On the audio, a woman’s voice can be heard coughing and complaining, saying, “My voice has been bothering me, I don’t know what it is.” Rivers’ longtime publicist Juy Katz immediately alleged that the audio was a hoax, saying, “The recording is a fraud. Joan never made any such tape. This is a publicity stunt that… is wholly disrespectful to the memory of Joan Rivers.”

Confidential has since unearthed more details. They spoke with Brad Zimmerman, who has not heard the video and insists that he was not responsible for any of the controversy. “I didn’t make anything up,” he said, reporting that he had no idea the story was about to be published. “All I know is, Joan was supposedly going to record a commercial for my show, then she went into the hospital and never came out….I’m as honorable as they come and this is enormously unfair.”

The show’s producer, Dana Matthau, alleged that Rivers was scheduled to tape the commercial the day she went into the hospital and that he had heard she had done a test run, but that no recordings appeared in the scheduled studio.

A friend of Rivers said that she had spoken with the comedian 2 days before the surgery and she had sounded like her normal self, not as tired or raspy as the voice in the audio.