Police announced at a late-night press conference that Isaiah Pretlow had been arrested by the U.S. Marshal's Service.
Police say Toney was shot while responding to a suspicious vehicle parked near a middle school in the Snellville area.
"He's still at large as far as we're concerned", Smith said.
Officers discovered that the involved vehicle had crashed nearby, which involved Pretlow, police said.
A police officer in Gwinnett County, Georgia, was shot and killed while answering a call about a suspicious vehicle on Saturday afternoon, according to a department spokesman. The suspect's name is Tafahree Maynard, and authorities warn that he should be considered armed and unsafe.
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Authorities say, two suspects, including one still being sought by police, have been charged in connection with the fatal shooting of a Georgia police officer.
One officer fired his stun gun, which didn't incapacitate Maynard, police said.
Antwan Toney and another officer approached a vehicle near the Shiloh Middle School in Snellville to check out a report of people smoking marijuana, according to Sgt.
"The people that worked with Officer Toney on a daily basis recalled a very jovial person who was dedicated to his job and dedicated to his community", Gwinnett County Police Chief Butch Ayers said.
His partner, who has not been identified, dragged Toney away for cover, Smith said.
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Toney, who had been with the department for nearly three years, was taken to Gwinnett Medical Center in Lawrenceville, Georgia, where he died.
The police department tweeted news of the officer's death Saturday evening. A helicopter flew above the vicinity of the middle school where the incident occurred.
Before he was an officer, he had been a security guard, police said. The funeral is set for 11 a.m. Wednesday in Lawrenceville.
The slain officer was the first killed in the line of duty since 1993, the Atlanta-Journal Constitution reported. There are no suspects in custody.
Three officers were shot to death in April 1964.
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Toney's death was the second fatal shooting of a law enforcement officer this week. "They said that he was the kind of guy that would walk into the room and he would just light up the room, and said he smiled everywhere he went". North Carolina State Trooper Kevin K. Conner was killed Wednesday during a traffic stop near the border with SC. Tipsters can remain anonymous.