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In the 911 call, the security guard says 23-year-old DeAndre Ballard "jumped" him and then tried to reach for his gun.
The shooting happened last week at Campus Crossing Apartments, where DeAndre lived and the security guard worked.
"Send an ambulance to Campus Crossing, 1400 East Cornwallis. I am a security officer. I just shot a male. A black male. He jumped me in my car," the security guard, who is also black, told the 911 dispatcher.
When the dispatcher asked what happened, the security guard said:
"Alright so, I'm sitting in my car. I see this guy trying to get inside somebody else's car. I said, 'Hey man what's going on?' He jumped me, he jumped me inside my car, he starts trying to fight me or whatever and tried to reach, tried to reach for my gun and that's when I think I had shot him."
The NC Detective Agency says it's supporting the security officer's claim of self-defense and no charges have been filed. They say it's the first deadly encounter for the agency and for the guard who's been employed for 15 years.
But Ballard's loved ones say they don't believe the security guard acted in self-defense.
"We just want the truth," Ballard's cousin Ontoia Becton told ABC11. "The truth. That's all we're asking for."
On the phone from New Bern, Becton explained what she says the security guard's employer, NC Detective Agency, told her family.
"They told his mom that DeAndre got inside the guard's car, tried to fight the guard and then he got back out and tried to grab the guard's gun. That's what they are saying. That's what they are telling his mom. And that doesn't sound like self-defense."
PREVIOUS CONCERNS ABOUT NC DETECTIVE AGENCY
Complaints have been raised before about NC Detective Agency with the state's regulatory board, the Private Protective Services Board.
In 2010, the company's CEO, Roger Ladd, was disciplined by the board for falsifying information on guard training certificates.
In 2011, an agency staffer was issued a warning by the board for making false statements connected to a license or registration.
And in 2012, Ladd was fined more than $2,600 for failing to properly register armed guards.
NC Detective Agency has declined to comment on Ballard's death, citing the active investigation by Durham Police Department.