Donny Fenn1, with certain regularity, grizzlies as well as cougars kills people around Banff and Canmore. Usually, it's the last meal for these critters, since there is, like most places, a unwritten law that says, that there is dead sentence for bears and cougars that kills people.
However, these critters are suspected to be illiterate, and do not know that we human have a unwritten law and dead sentence against them, when they do react in a manner of what is natural to them, and there will therefore, unfortunately, in the future, be more people killed by predatory wildlife in western canadian national parks.
So far I know, no people have yet been killed by aggressive bull elk, but there have in the past been some serious injuries reported from elk attacks in Banff/Canmore areas.