According to police, the buyer used an online selling app called "Let Go" to arrange the deal.
Police say a 46-year-old man was waiting in his car in the parking lot of an apartment complex on Greens Parkway around 10 p.m. Tuesday.
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He told investigators that a man wearing a mask walked up and pointed a rifle at him, so he pulled out his own gun and started shooting because he thought he was going to get robbed.
The suspect was shot and killed.
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The buyer was a licensed concealed carry holder. The district attorney will decide on potential charges.
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