A woman has died in hospital more than a week after she was exposed to novichok in the first death from the nerve agent attack on Britain that the government has attributed to Russian Federation.
Sturgess and a 45-year-old man both took ill at a residential address in Amesbury on June 30.
Her death comes four months after the poisoning of.
Neil Basu leads counter-terrorism efforts for the Metropolitan Police force.
Fire and Rescue Service personel arrive with safety equipment at the site of a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018.
"We are not in a position to say whether the nerve agent was from the same batch that the Skripals were exposed to", they said.
The possibility that the two investigations might be linked is "clearly a key line of inquiry for police", the Met said. Russian Federation has denied the allegation.
She offered her condolences to the relatives and loved ones of Sturgess, 44, who had three children. "Police and security officials are working urgently to establish the facts of this incident, which is now being investigated as a murder".
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She said: "The government is committed to providing full support to the local community as it deals with this tragedy".
Counterterrorism police are also studying roughly 1300 hours of closed circuit television footage in hopes of finding clues about the couple's activities in the hours before they became violently ill.
The 67-year-old ex-agent was living in Salisbury, a cathedral city 145 kilometres southwest of London, when he was struck down along with his daughter, Yulia, who was visiting him.
The British couple were believed to have become exposed to Novichok by handling a "contaminated item", with speculation that it could have been the container used to administer the nerve agent to the Skripals. Skripal was discharged from the hospital in May and his daughter was released in April. A number of Western countries expelled dozens of Russian diplomats in response to the poisonings. The hospital's medical director, Dr. Christine Blanshard, said the staff "worked tirelessly to save Dawn".
Salisbury District Hospital treated Sturgess and Rowley.
Sergei Skripal and his daughter, Yulia, almost died of exposure to Novichok left on the front doorstep of Sergei's home in March.
Public Health England said the risk to the general public "remains low".