Elementary Scoop: John Hannah Cast as Sherlock's Former Drug Dealer

Elementary; John Hannah inset | Photo Credits: John P. Filo/CBS; Getty Images

Sherlock will soon get a blast from the past: John Hannah has been cast as Sherlock’s old drug dealer from London, executive producer Rob Doherty announced Saturday at Elementary‘s winter TV preview panel.

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TVGuide.com has since learned that Hannah will play…

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