British counter-terrorism detectives announced Friday they believe they have found the source of a Russian nerve agent that killed a woman and left a man critically ill. Sturgess, 44, subsequently died on July 8.
The vessel found in Rowle's house cointained the lethal substance produced in the Soviet Union during the Cold War, scientists confirmed.
Meanwhile, Ms Sturgess's son, Ewan Hope, 19, has called on US President Donald Trump to raise his mother's death with Vladimir Putin when they meet in Helsinki.
Her husband, Mr Rowley has since regained consciousness but remains in serious condition, as hospital staff continue to treat him.
Wiltshire Police Chief Constable Kier Pritchard said the discovery of the bottle was "significant and encouraging".
Police said they had spoken briefly to Rowley and hoped to speak to him again, as they seek to establish how the couple were contaminated.
The bottle was found at Rowley's home in Amesbury, a southwestern town not far from Salisbury, where British authorities say Russian ex-spy Sergei Skripal and his daughter Yulia were poisoned with Novichok in March.
Police are working around the clock to determine where the Novichok bottle came from and how it ended up in Mr Rowley's home.
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Assistant Commissioner Neil Basu, national lead for Counter Terrorism (CT) Policing in the United Kingdom, described the process as "painstaking and vital work". Most likely, a couple of Brits suffered from the remnants of the substance are a novice, which was poisoned ex-GRU officer and his daughter.
"However, we can not guarantee that there isn't any more of the substance left and cordons will remain in place for some considerable time", he said.
Staff from the Organisation for the Prohibition of Chemical Weapons (OPCW) will travel to the United Kingdom to independently confirm the identity of the nerve agent which led to Ms Sturgess's death.
The two latest victims fell ill in nearby Amesbury.
Basu said Friday that cordons would remain in place in some locations to protect the public despite the apparent breakthrough in the case.
The British government previously blamed Russian Federation for Sergei Skripal's attempted murder, but Russian Federation denied such claims.
Public Health England has advised citizens not to pick up unusual items made from glass, metal or plastic.