Dave Legeno that interpreted Fenrir Greyback on Harry Potter died 

On Sunday 6 July 2014, hikers found Legeno’s body in Death Valley, California It appears that Legeno died of heat-related issues.

I'm so sad like I wasn't a fan of Harry Potter but it was a sad news

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Source: http://harrypotter.wikia.com/wiki/Category:Deceased_actors_(real-world)