Really sad to hear this...my thoughts and prayers go to all families who lost their beloved ones.
Anyway, I‘m currently looking through the web, and I found the following on a German news website: (translated ofc)
"It looked like the copilot deliberately brought the plane to a descent", said Robin.
(...)
"According to the information, the investigators could listen to the final 30 minutes of the conversation between the pilotand the copilot. For the first 20 minutes everythiing seemed normal."
(...)
"As the copilot was alone in the cockpit, it was hearable that he was operating the Flight Monitoring System to bring the plane to a descent. It‘s also hearable the pilot asking the copilot to let him back into the cockpit, but the copilot didn‘t answer him. The copilot hadn‘t said a single word while he was alone in the cockpit."
(...)
"The pilot was knocking at the door from the outside. Until the moment of impact, you could only hear the copilot breathing in the cockpit. He breathed normally."
(...)
"We think that two deliberate actions happened: to refuse the pilot to get back into the cockpit and to bring the plane to a descent."
I know, it‘s not the best translation. But that‘s all I can do.