Investigators find evidence German co-pilot hid illness before fatal crash

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DUSSELDORF, GERMANY - He deliberately crashed a German airliner into the French Alps, killing all 150 people on board. Now, we're learning that Germanwings co-pilot Andreas Lubitz was hiding a deadly secret: there was something medically wrong with him.

Police searching his home found a torn up doctor's note saying Lubitz was unfit to fly. Seized medical documents indicate he was being treated for some kind of illness, but Lubitz never told his employer.

Before being hired by Germanwings he passed a psychological test deeming him fit to fly. But there must have been some extremely dark thoughts brewing inside.

What else could explain him locking the captain out of the cockpit, and setting a course to death?

Investigators say the cockpit voice recorder caught the desperate screams of passengers in their final moments. Lubitz was silent.

"We deal with terrorists and people that aren't supposed to be in the cockpit," said retired military pilot Major General H.H. 'Bugs' Forsythe, "this person's supposed to be in the cockpit. That's what's scary."

The lock on the inside of the cockpit, meant to protect pilots, is what ended up sealing the fate of the innocents on board. So, now airlines from around the world are changing protocol, requiring two crew members in the cockpit at all times. The FAA already requires this in the U.S.

It won't change the past, but it could prevent another unstable pilot from committing mass murder.