Zaid al-Hilli, who was accused of orchestrating the shooting of his brother Saad al-Hilli, his wife and mother-in-law, has had his bail cancelled because there is not enough evidence to charge him with a crime, police said.
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Detectives in Westminster are investigating after the man was discovered on the Route 189 bus in Marylebone shortly after midnight.
The murderer was shaking and appeared to be gasping for air for around 13 minutes before dying.