German investigators have discovered a medical leave note from a doctor issued for Germanwings first officer Andreas Lubitz (above) that included the day of the French Alps crash, the Dusseldorf public prosecutor’s office said, according to CNN.

Lubitz tore up the medical leave slips and kept the undisclosed illness secret from his employer. It is suspected the illness could have prevented him from advancing in his aviation career.

Note: The German prosecutor has just confirmed it was a medical illness (not a mental condition). It has been reported he was deemed “unfit for work” and was hiding this information according to German investigators.

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