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Amanda Burton is officially returning to Silent Witness \u2013 and RadioTimes.com<\/a> can exclusively unveil a teaser clip showing the moment Dr Sam Ryan meets Emilia Fox\u2019s Dr Nikki Alexander.<\/p>\n The BBC One drama is celebrating its 25th anniversary series this year, and the broadcaster is marking the event with the comeback of its original star<\/a>, Burton, who led the series for its first eight seasons as forensic pathologist Sam Ryan.<\/p>\n Six new episodes, beginning this Monday 23rd May<\/strong>, will see Sam Ryan calling on the Lyell team for help 17 years after her own departure \u2013 a call necessitated by a high-profile assassination attempt in Liverpool.<\/p>\n In the new clip, the current Lyell team are flown in by helicopter and are greeted by Sam Ryan and her colleagues.<\/p>\n \u201cGood to finally meet you, Nikki,\u201d Sam says, praising her \u201cextraordinary work at the Lyell\u201d.<\/p>\n Nikki demurs: \u201cWe\u2019ve just built on your foundations.\u201d<\/p>