The most popular theory involves the final scene in the series finale.

At one point in the scene, a man in a Members Only jacket enters Holsten’s.

This theory can also be supported by one particular moment in the episode that requires fans' full attention.

Tony Soprano (James Gandolfini), Silvio Dante (Steven Van Zandt), and Corrado

Image by Federico Napoli

Paulie Gualtieri also makes an appearance as Tagliano’s brother.

While there are several plausible theories regarding Tony’s fate, some are much more believable than the others.

Keep Reading:The 10 Most Important Episodes of ‘The Sopranos,’ Ranked

Joe Pantoliano as Ralph Cifaretto, smiling in The Sopranos

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An orange cat sitting on a table in The Sopranos episode Made in America.

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From Where to Eternity - The Sopranos - 2000

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The Sopranos - The Russian - Valery

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Edie Falco is behind James Gandolfini as he holds her hand on his shoulder in the woods in The Sopranos.

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Lou Bonacki as Francis Satriale has a tense conversation with two other men in The Sopranos.

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Annabella Sciorra as Gloria Trillo in The Sopranos.

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James Gandolfini as Tony Soprano wiping his forehead with a cloth in The Sopranos.

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Steven Van Zandt as Silvio Dante lying in a hospital bed in a coma in The Sopranos.

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Tony (James Gandolfini) looks up from a tabletop jukebox in the finale of ‘The Sopranos’

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The Sopranos