British counterterrorism police on Tuesday took charge of the investigation into the death in London of a Russian businessman because he was connected to a prominent Kremlin foe.

The death of Nikolai Glushkov, confirmed by his lawyer in Russia, came a week after former spy Sergei Skripal was left critically ill from nerve agent poisoning in the city of Salisbury.

Police said there was no evidence to suggest a link to the March 4 poisoning of Skripal and his daughter Yulia.

Attorney Andrei Borovkov told Russian media outlets that Glushkov had died, but said he was unaware of the time and circumstances. Reports in British and Russian media said Glushkov, who was in his late 60s, was found dead at his home in southwest London.

Read more: Washington Post