Security Guard Accused of Killing Coworker to Appear in Court

ATLANTA - A security guard accused of gunning down a coworker is expected to go before a judge on Friday. 

Employees arrived at their Buckhead office at Tower Place Thursday morning stunned to see police tape and homicide detectives investigating a murder.

Atlanta Police told us security officer Dexter Harper shot and killed his co-worker, another security guard, identified as Emmanuel Nwankwo, 23, around 5:00 a.m.

Those who know Harper said this murder charge is out of character.

"He is the nicest guy. Everyone in our building will vouch for that. He opens doors; he lets you up the elevator, if you are locked out. He'll let you back in. He is just an all-around good guy," according to Taylor Nocerini who works in building at 3348 Peachtree Road.

Homicide detectives said the two security guards were in the skyscraper alone when they apparently began arguing.

Police said surveillance video didn't capture the deadly shooting but was helpful in showing them what happened.

"We have two security guards who were working at this location. We are not sure what the motive was.  We have been told there may have been some type of verbal argument that escalated into the gunfire," Atlanta Police Lt. Charles Hampton said.

Meanwhile, people like Jessica Burnett, who talked with Harper daily, wonder if there is more to this story.

"I feel like maybe it could have been self-defense because he is so nice. It seems so out of character," employee Jessica Burnett commented.

The Georgia State College of Business had some MBA classes canceled because of the deadly shooting.