You could just look up Roses's link. He did not flee and was unaware that he was being followed. We can be pretty sure that police will try and cover up these kinds of erroneous actions and deaths, preferably erasing them from memory and recorded history. There have been many examples over the years.
Quite a lot of the facts are still disputed, but the police believed that he was about to commit mass murder. They were mistaken and one man died, had they failed to identify and neutralise and actual terrorist a great many people would have died. I'm sure we all hope the police and other security services learn from their mistakes, but there are no totally safe options - in today's climate of terror it can be more dangerous
not to kill a suspect than kill them.
I read the other day how the first Nazi bombing of London was due to a military bombing raid that had mistakenly gone off course. Churchill responded by ordering the bombing of civilian targets in Berlin - to which Hitler responded by declaring "total war" - with all civilian targets seen as valid, and starting the Blitz.
I believe that is true, and many believe that that 'mistake' allowed Britain to win the war. This was the Battle of Britain and the Nazis were on the verge of destroying our air defences but the shift to bombing cities took the pressure off the RAF and allow them to gain the upper hand.