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The case of the crypto tycoon allegedly tortured in an NYC townhouse is heating up … because a second suspect just surrendered to the authorities for his purported role in the bizarre incident.

Sources with direct knowledge tell TMZ ... William Duplessie -- a businessman from Switzerland -- turned himself in Tuesday to the NYPD Major Crimes Unit. Play video content

Our sources say Duplessie is the second person arrested in connection with the alleged abduction and torture of Michael Valentino Teofrasto Carturan inside a SoHo townhouse over several weeks.

His alleged accomplice, John Woeltz , was busted Friday and charged with several felonies -- assault, kidnapping, unlawful imprisonment and criminal possession of a firearm.

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