As always, there were many small causes which contributed to the crash of the "Kulmbach":
1) Shortly prior to touch down the wind had turned. ATC did not inform the crew of this so they landed, unbeknownst to the, with a tailwind.
2) Due to the bad state of the runway there was water on the runway. This water turned into steam when the plane touched down because of the heat caused by touching down. The wheels floated on the stem, thus not rolling, and consequently the aircraft´s computer didn´t allow braking. Braking became possible only when the steam had evaporated; by then, an overshoot was inevitable.
3) This would have been not fatal but for an earth wall piled up directly by the end of the runway into which the plane crashed and burned out.
The ONLY fatality beside the F/O was a passenger who had unbuckled immediately upon touch down.
The F/O died because the captain turned the a/c to the left just before imfacting the earth wall. He did so in order to increase the chances of survival for the passengers (apperently successfully).
The F/O was actually a captain checking the real captain who was returning from a very long sick leave.
The captain continued flying for LH a few more years. Then he decided to quit flying altogether and became a painter. I don´t remember whether the crash contributed to his decision, I watched some interviews of his.
Hope this helps,
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Photo © Wojtek Werpachowski