Co-pilot Andreas Lubitz researched suicide and the security of cockpit doors before the March 24 Germanwings crash, according to new information from German prosecutors.
Dusseldorf prosecutors said Thursday investigators found a tablet computer at Lubitz's apartment and reconstructed searches from March 16 to March 23.
In a separate development, the second black box of the Germanwings flight 9525, which crashed in the French Alps killing all 150 passengers on board, was found, according to a French official.
The data recorder may offer new insights into the final moments of the flight.
Marseille Prosecutor Brice Robin's office said he will give a news conference on Thursday evening about the discovery, according to the Associated Press.
The flight recorder documents details of the flight, including airspeed, thrust, flap settings, and descent and ascent rates, among other things.
Analysis of the first black box, which contained the audio recording of cockpit communications, revealed that Lubtiz was alone at the controls at the time of the crash and appears to have intentionally downed the plane.
Additional information from the Associated Press.