I don't know much, but when it comes to killing and shit like that, I'm your man.
Google it Lance, it was an interesting case and there is a push for it to be reopened. He was done on Tower Bridge in the late 70s with the old poison umbrella trick. He was a Bulgarian dissident who came to London to escape the regime and to carry on broadcasting and publishing his anti-communist work.
It has the KGB written all over it....despite denials for 30 years.