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Stefanie Pieper -- an influencer from Austria -- has reportedly been found dead in a forest in Slovenia after her ex-boyfriend allegedly confessed to killing her.

Austria's largest newspaper, Kronen Zeitung , reports Stefanie's body was uncovered after investigators claimed her ex admitted to strangling her and took investigators to where he'd hidden the body. Instagram / @badgalfani

The man has reportedly been extradited from Slovenia back to Austria, and his brother and stepfather have also been arrested.

Pieper was last seen Sunday at a holiday party ... and, friends and colleagues alerted the police when she didn't show up to a modeling shoot. Instagram / @badgalfani

Police arrested Stefanie's alleged killer Monday after they found

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