The banker was left for dead by a lone gunman as he returned to his home in Canary Wharf on Tuesday evening. Scotland Yard detectives are investigating the attempted assassination, which Mr Gorbuntsov’s lawyer believes was a retaliation attack after the banker gave evidence in a 2009 attempted murder case. Mr Gorbuntsov, who fled to London because of his fear of reprisals, had recently submitted new evidence to Russian police about the attempted murder of Alexander Antonov, another Russian banker. The case was closed three years ago when three Chechen men were jailed for attempted murder. But police have never discovered who organised the attempted hit. Officers re-opened the case on March 2 this year after Mr Gorbuntsov submitted his new testimony.