Only two people have made money speculating on Dorothy Kilgallen's death: biographer Lee Israel and Sara Jordan, author of the Midwest Today article that John Oshea evidently read.
Israel and Jordan are sane compared to the people who have made money speculating about two people who had many connections to What's My Line guests though they themselves never appeared: Marilyn Monroe and Janis Joplin. Both of those ladies died from substance abuse despite what any conspiracy theorist says. Ms. Joplin's personal problems have been verified by Alistair Cooke, who knew her personally even though he was clean and sober. His son John Cooke was the person who found Ms. Joplin's body in her motel room. She was clutching four dollars and fifty cents in one of her hands.
Police quickly learned why she was clutching it when they questioned the motel desk clerk. He explained that he had changed a five-dollar bill for Ms. Joplin so she would have fifty cents to buy a pack of cigarettes from the cigarette machine that was a few feet away from the desk. That she never let go of her four dollars and fifty cents established that she was dying from her dose of heroin while she chatted with the desk clerk -- about an intelligent topic? The use of dynamite in coal mines? Oswald? No, Ms. Joplin simply bragged about the music she was recording during her stay in Los Angeles, and you can do that while you're stoned. I don't believe the desk clerk was part of a conspiracy, and I don't believe Alistair Cooke was, either.
I enjoyed "Omnibus" and his much-later PBS series. It's amazing that such a smart man could have a son who was dumb enough to say that because Ms. Joplin clutched four dollars and fifty cents in her hand at the moment of her death, that means "she was a good businesswoman to the end." (Source: a Joplin biography by Ellis Amburn) Oh well, all you have is yourself. You can be an excellent parent but you don't know what stupid things your son or daughter could be doing when you're not there.