The Kremlin may have covered up the murder of a former KGB chief accused of helping ex-MI6 spy Christopher Steele to pull together the notorious dossier on Donald Trump.
Oleg Erovinkin served as a general in the KGB and was found dead on Boxing Day in the back of his car in Moscow.
It has been claimed he died of a heart attack, but an expert on Russian security threats believes he was murdered for his role in the explosive dossier.
The suspected murder victim was close to former deputy prime minister Igor Sechin, who is named throughout the leaked memo, according to the Telegraph.
Erovinkin is understood to have been an important link between Sechin and leader of the Kremlin Vladimir Putin.
Agent Steele's dossier, which was made public earlier this month, noted how he had a source close to Sechin.