Cyrena Barned said outside court that she was pleased with the 31-year sentence received by Dean Smith, for the murder of her brother Aarron McKoy.
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London City Airport estimates the scheme will create 1,600 jobs for staff, together with 500 construction jobs.
Essex Police has become one of only four forces to use polygraph testing to help manage the risk posed by convicted sex offenders.
Two members of the public were injured along with two police officers who were in the unmarked vehicle.