Germanwings co-pilot Andreas Lubitz, received treatment for suicidal tendencies before getting his license, investigators into the crashed plane said Monday, according to BBC.
But, they stressed, the treatment had not taken place recently.
Lubitz, 27, is believed to have deliberately crashed an Airbus into the French Alps last week, after locking the plane's pilot out of the cockpit. All 150 people on board were killed.
According to officials in Dusseldorf, despite reports that Lubitz suffered from depression, no clue to his motives have been revealed.
Ralf Herrenbrueck, a spokesman for Dusseldorf prosecutors, said Lubitz received treatment "with a note about suicidal tendencies" for several years before becoming a pilot.
Since receiving his license, however, Lubitz' health records show no such treatment and disprove claims of "organic diseases" like a retinal eye problem.
"In the following period, and until recently, further doctor's visits took place, resulting in sick notes without any suicidal tendencies or aggression against others being recorded," Herrenbrueck said.
"There is no evidence to show that the co-pilot was about to do what he appears to have done."
Investigators found nothing in Lubitz's "personal and professional life that can enable us to say anything about his motive." No suicide note or letter was left, Herrenbrueck added.