Duesseldorf prosecutor Christoph Kumpa confirmed a report today in German daily Sueddeutsche Zeitung that Andreas Lubitz searched on the Internet in March for ways of getting hold of potassium cyanide, valium and lethal combinations of medicines.
He also searched for the term "living will" on the afternoon of March 23, the day before the crash.
A living will spells out a patient's wishes for medical care if he is unable to communicate with doctors.
A key source of evidence has been the browsing history on a tablet computer found at the 27-year-old's apartment, and prosecutors previously have said that he spent time online researching suicide methods and cockpit door security in the week before the crash.
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Some of the doctors felt Lubitz was psychologically unstable, and some felt he was unfit to fly, but didn't report that information to anyone because of medical secrecy laws, Robin said.
He added that it wasn't yet clear if the vision woes were real or imagined.