Quoted from
www.swissinfo.org (English version of Swiss news website).
Ric
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"The suspect, a 48-year-old man, was arrested close to the town of Kloten near Zurich on Wednesday night. Police have refused to disclose his nationality.
The suspect was questioned and he denied committing the murder.
"But he gave the impression that he had not come to terms with the death of his daughter, son and wife who died in the accident," said Zurich prosecutor Pascal Gossner.
Gossner said the man had been in Switzerland once before to attend a memorial service for the victims of the crash. Police said he had "drawn attention to himself" at the service.
Suspect seen at murder scene
Police said the suspect had spoken to a neighbour of the 36-year-old victim on Tuesday evening.
The suspect was holding a piece of paper and wanted to know where the air traffic controller lived.
Gossner said the suspect then went and sat in the victim's garden.
According to police the victim's wife also spoke to the man. A short while later she went back inside her home and heard a sound she couldn't identify.
She then saw her husband lying on the ground and the suspect fleeing the scene.
Police said they later found a knife with a 14cm blade - suspected to be the murder weapon - close by.
The Danish victim, who died at the scene worked for the Swiss air traffic control agency, Skyguide. He had lived in Switzerland for seven years and was the father of three children."
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