The killer is identified as a man in his late forties, speaking broken German. He stabbed the controller, a 36-year-old Danish national, at his home outside Zurich late last night. The victim's wife was in the house at the moment of killing. The investigators are now trying to find out if he received any threats before his violent death.
The controller, employed by the Swiss air traffic agency Skyguide, was the only one on duty the night of the fatal collision between a Boeing cargo jet and a Russian Tu-154 airliner. According to one of the theories, the tragedy was a direct consequence of his erroneous instructions to the pilot of the Russian plane.