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>> where they were, and what they did would launch a terrifying case. >> why did have to happen here? >> with a deadly end. >> nobody's leaving until we figure out what happened. >> a man at home, alone, and afraid. what would you do, if you felt in danger? >> they were really attacking his home. >> you have a right to protect your home, and to protect yourself. >> he planned. he prepared. and he was determined to kill. >> the most chilling detail of all. what you'll hear on tape. ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ ♪ hello and welcome to "dateline. " growing up...

Murder? or self-defense? >> why did he wait so long, before calling authorities? >> fear. >> the explosive debate heads into court. when "dateline" continues. >> byron smith's first-degree murder trial got under way in april, 2014. and just like the town, itself, carved in two by the mighty, mississippi river. the before calling authorities? >> fear. >> the explosive debate heads into court. when "dateline" continues. continues. th seresto. seresto. learn more at seresto.com. ♪ ♪ okay, snacks and popcorn are gonna be expensive.