An ex leo, who prolly had a firearm, is killed by a guy with a blade.
Just goes to show, that banning the weapon, or having the weapon, doesnt mean squat, as long as there are nutjobs that want to kill you, and have the patience to set up a plan...
And remember: the tool used can be made from a flat piece of metal and a rock. This notion of legislating control of inanimate objects is pointless so long as there are inanimate objects and perps willing to misuse them.