Police read a statement from Miss McGrath's parents, Christine and Joe, and the rest of the family. "We would like to express our thanks to Detective Superintendent Jeff Hill and all of the current members of his cold case team for their hard work, dedication and professionalism."
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It will be a dry day and very warm with bright and sunny spells.
Armed officers will be on patrol at major infrastructure sites across Essex and the county will see more police patrols.
The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.