How did Johnny Soprano die?

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Johnny Boy also kept a mistress named Fran Felstein with whom he remained until his death in 1986 of emphysema.

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Yea, if I'm not mistaken, I think Tony got pissed because either his mom or the mistress when he found it she still smoked while his Dad was dying of emphysema.

I think it was the mistress, maybe.

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