There are new concerns about self-defense laws in America after a German exchange student was shot dead by a Montana homeowner after he illegally entered the man's garage.

The teen was unarmed. His family in Germany is slamming the United States's gun culture, saying "America cannot continue to play cowboy."

But the homeowner, Markus Karma, says the killing was justified.

And because of updated "castle" laws in Montana - which state your home can legally be protected by using force - Karma may have a case.

CNN's Kyung Lah has the story.