"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.
"Dawn leaves behind her family, including three children, and our thoughts and prayers are with them at this extremely hard time", said Neil Basu, assistant commissioner and head of UK Counter Terrorism policing.
Britain's home secretary is visiting Amesbury and Salisbury in southwestern England to reassure residents that the risk to the public remains very low despite the recent poisoning of two people exposed to a deadly nerve agent.
There is no evidence that Sturgess and the other victim visited any of the sites that had been decontaminated after the Skripals' poisoning, police said, adding that they could not say whether the nerve agent came from the same batch as the one the Skripals came in contact with.
"Dawn's family has asked the media to kindly respect their privacy at this hard time". "However, it is important that the investigation is led by the evidence available and the facts alone", the Met said.
Reports Say First Two Boys Brought Out of Cave
AFPnews agency quotes an official saying four boys in Thai cave have reached a rescue camp, and will walk out of the cave soon. They were discovered by a team of British divers on Monday and rescue operations have been meticulously planned all week.
"The Government is committed to providing full support to the local community as it deals with this tragedy", she wrote in a second tweet.
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.
Prime Minister Theresa May said police were still hard at work investigating the source of the nerve agent.
The poisoning of the Skripals, both of whom spent weeks in hospital before being discharged, was blamed by the United Kingdom government on Russian Federation.
The hospital's medical director, Christine Blanshard, told the BBC that hospital staff worked tirelessly to save Sturgess.
FILE PHOTO: A police officer stands in front of screening erected behind John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018.
Yulia Skripal, Sergei's daughter, was in a coma for 20 days after she was attacked and was eventually discharged about five weeks after the poisoning.