"The 45-year-old man who fell ill with Dawn remains critically ill in hospital and our thoughts are with him and his family as well", he said in a statement.
Police had been working to discover how Dawn Sturgess and a 45-year-old man had come across an item contaminated with Novichok, which was developed by the Soviet military during n the Cold War.
Police suspect they were exposed through a contaminated item left over from the first attack, which Britain blames on Russian Federation.
A woman exposed to nerve agent Novichok in Amesbury has died, police have confirmed, as a murder investigation has been launched.
"Dawn leaves behind her family, including three children, and our thoughts and prayers are with them at this extremely hard time", Assistant Commissioner Neil Basu, head of UK Counter Terrorism policing, said Sunday.
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It is with great sadness that we have learned of the tragic death of 44 year old Dawn Sturgess, as reported by AC Neil Basu and the Prime Minister.
"As confirmed by the Counter Terrorism Policing Network this evening, Dawn's death is now being treated as murder".
"We are not in a position to say whether the nerve agent was from the same batch that the Skripals were exposed to", police said. Sturgess was taken to hospital around 10.15am and Rowley several hours later, around 3.30pm.
A British woman poisoned by exposure to the nerve agent Novichok has died, according to reports.
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He said the situation in southern Syria was a cause for serious concern and needed to be resolved as soon as possible. Last week, rebels said it had told them not to expect any United States military support.
Sergei Skripal and his daughter, Yulia, almost died of exposure to Novichok left on the front doorstep of Sergei's home in March.
Police officers stand guard near barriers across Rollestone Street, outside the John Baker House Sanctuary Supported Living in Salisbury, southern England, July 8, 2018.
Public Health England said the risk to the general public "remains low".
Police said Ms Sturgess' family had been notified and were receiving support.
Hospital officials said late Saturday that a number of people including a police officer had sought medical advice in the last week but had been found not to need any treatment.
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