Police Sgt David DeFoor said the officer was placed on administrative leave immediately after he shot at Monroe Isadore, who opened fire on authorities.
"That is department policy when there's an officer-involved shooting that they're put on admin leave until the investigation is completed," DeFoor said.
Police would not identify the officer, who has not been charged with any wrongdoing. DeFoor said he believed the officer placed on leave was the only one who fired at Isadore.
The fatal shooting happened Saturday after police said they were called to a domestic disturbance at the house where Isadore was staying.
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Laurie Barlow, 48, of Lonoke, told officers she had gone to the house where Isadore was living temporarily to help him move to a new home, according to a police report. She said Isadore had previously been excited about the move but that when she arrived Isadore barricaded himself in a room.
After police moved Barlow and the granddaughter across the street, Isadore fired at a door moments after police tried to contact him. A police commando team, called out when negotiations failed, manoeuvred a camera into the house to see how Isadore was armed, then stormed inside after deploying gas and a distraction device, the report said. When Isadore fired, the entry team fired back.
"I don't know what was going at the scene that would make them go ahead and go in," DeFoor said. "When shots are fired, it changes the whole idea of let's sit out here and wait."
Prosecutors are expected to review the case as early as this week.