16 critics of Vladimir Putin who died violently or in suspicious ways

A number of high profile critics of Putin and his policies have ended up murdered over the years

Famously, the murder of Alexander Litvinenko occurred on British soil - after the former spy died from poisoning after drinking a laced cup of tea.

Here are some of the other people who openly criticised Putin — a former lieutenant colonel of the KGB, and ex-head of the FSB — before they died.