Sturgess and Charlie Rowley, 45, fell ill last weekend in the town of Amesbury, near Salisbury, the city where former double agent Sergei Skripal and his daughter Yulia were attacked with Novichok in March.
"That is something that I think the world will unite with us in actually condemning", Williamson said.
Peskov said that linking Russian Federation to the poisoning would be "absurd".
Dr. Christine Blanshard, medical director at Salisbury District Hospital where Ms. Sturgess died, said it was "desperately sad" and she expressed condolences to the 44-year-old's family.
Specialists at the nearby Defence Science and Technology Laboratory at Porton Down identified the agent used against the Skripals, Sturgess and Rowley as Novichok.
Mr Basu said detectives will continue with their "painstaking and meticulous work to gather all the available evidence".
Two days later, three days after the attack, the police confirmed the use of nerve agent. The Kremlin is alarmed at the repeat poisonings that recent hit Great Britain since this poses a grave danger to all of Europe, Russian Presidential Spokesman Dmitry Peskov told reporters.
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"In the four months since the Skripals and [Detective Sergeant] Nick Bailey were poisoned, no other people besides Dawn and Charlie have presented with symptoms", Mr Basu said.
Hours later, emergency workers responded to the same address after the 45-year-old man had fallen ill, police said.
The death of Sturgess is now being investigated as a murder.
They are scouring Ms Sturgess and Mr Rowley's homes...
The assistant commissioner for the Metropolitan Police also revealed that Sturgess and Rowley were poisoned when they came across a container or vessel contaminated with Novichok.
Several sites are being searched by the local and Scotland Yard counter terrorism officers, including Queen Elizabeth Gardens in Salisbury, a property at John Baker House, Rolleston Street, Salisbury, a property on Muggleton Road, Amesbury, Boots the chemist, Stonehenge Walk, Amesbury, and the Baptist church on Raleigh Crescent, Amesbury.
He said no one else in the area has shown any sign of Novichok poisoning.
The head of Britain's counter-terror police also said he could not rule out further contaminations. They say the poison could remain potent for months, particularly in a closed container. Notably, neither United Kingdom specialists at the Porton Down laboratory, nor the Organization for Prohibition of Chemical Weapons (OPCW) identified Russian Federation as the origin of the nerve agent.
"Right now, the final stage of the 2018 World Cup [hosted by Russia] and the summit between Russian Federation and the United States in Helsinki are coming".