Your story reminded me of the young pilot who committed suicide by crashing a German airliner into the remote French Alps.

The shocking thing was he did not know he actually jumping off the cliff to end his own life.

Yes, that's true. A psychiatrist told me the same. Your friend MUST seek professional help ASAP as there's a high probability he might do it again without knowing it. Go to UH Psychiatric Ward (Menara Selatan) -- much cheaper than private practice.