Police have launched a murder inquiry after a woman exposed to nerve agent Novichok in Wiltshire died.
Dawn Sturgess, 44, died in hospital on Sunday evening after falling critically ill on 30 June.
Charlie Rowley, 45, who was also exposed to the nerve agent in Amesbury, remains critically ill in hospital.
Theresa May said she was “appalled and shocked” by the death, which comes after the poisoning of Sergei Skripal and his daughter Yulia in Salisbury.
A post-mortem examination of Ms Sturgess, from Durrington, is due to take place and her family has been informed, police said.
The investigation is being led by detectives from the Counter-Terrorism Policing Network and about 100 detectives are working on the case alongside Wiltshire Police.
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