Audi CEO Rupert Stadler was arrested in Munich on Monday in connection with the diesel-cheating scandal, making him the highest-profile target in the probe that’s engulfed the carmaker and parent Volkswagen for almost three years.

Munich prosecutors investigating Audi’s role in the 2015 scandal confirmed they arrested Stadler, 55, in the Bavarian capital because of risk he may tamper with evidence, according to an emailed statement Monday.

The decision throws into doubt the manager’s future at the helm of Volkswagen’s most important earnings contributor. Pressure on Stadler has steadily built over the past few months, including a raid at his home last week. Until now, backing of the Porsche and Piech families, who control the world’s biggest carmaker, ensured him continuing in the role he’s held since 2007.

Volkswagen’s supervisory board is meeting on Monday, where Stadler’s future will be among the topics of discussion.

Prosecutors in Munich, Stuttgart and Braunschweig are continuing their investigations of the carmaker and its units. In April, Stuttgart authorities arrested a senior engine manager at the company’s luxury Porsche brand, after conducted raids at 10 sites as part of a long-running probe.

Wolfgang Hatz, a former VW manager who joined Audi unit in 2001 and from 2007 to 2011 ran VW’s motor development, remains in custody in Munich.

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