On 4 March 2018 , he and his daughter Yulia , who was visiting him from Moscow , were poisoned with a Novichok nerve agent . they were in a critical condition at Salisbury District Hospital . The poisoning is being investigated as an attempted murder . He holds both Russian and British citizenship . On 21 March 2018 Russian ambassador to the UK Alexander Yakovenko said that Sergei Skripal is also a Russian citizen
were poisoned
Poisoning of Sergei and Yulia Skripal
Sergei Skripal