It's not certain yet, but from the sounds of things everyone is pretty sure it was a wolf (wolves) who killed a female runner in Alaska. She was only five feet tall, so not an imposing figure.
But before people start worrying too much about wolves, such attacks are exceedingly rare in North America.
If confirmed, this will be only the first fatal wolf attack in Alaska and the second documented fatal attack by a healthy wild wolf in North America (the other being an attack in 2006 in Canada). Inuit oral traditions speak of a couple of killings over the last few hundred years and Native Americans talk of occasional attacks, but we're talking one every century or two.
There have been a few fatal attacks by wolves kept as pets, and a few by rabid wolves, but healthy ones almost never kill people in North America. And it's only the Grey Wolf engaging in attacks, the red wolf has never been implicated in an attack.
The situation in Europe is different, of course and your wolves are more aggressive -- no one is sure why.
In any event, it's a sad story.