Reached by phone Friday, Chamblin declined to comment about the ongoing investigation, but told Marine Corps Times that he and Buckingham had been together since last April and were engaged.
Photo Credit: Roane County Sheriff's Office
She allegedly paid an undercover agent with the Tennessee Bureau of Investigation to kill Sutherland, who lives in New Albany, Indiana, the Sentinel reported. The two have a 3-year-old son together, according to the sheriff's office release.
"[Buckingham] acted with intent to complete a course of action that would constitute the offense of premeditated murder by hiring and paying another to kill Bradley Sutherland and thereby taking a substantial step toward the commission of that offense," the release states.
Chamblin, who shared a rental home with Buckingham, became concerned after she allegedly asked him about killing Sutherland several times, the Sentinel reported.
"She stated to him that since he was in the military maybe he had some friends that could do this for him," a police incident states, according to the Sentinel.
The incident received international condemnation when the video surfaced online in January 2012. Chamblin later faced a special court-martial and lost a rank. He left the Marine Corps as a sergeant in 2013.
He told Marine Corps Times in an October 2013 interview that he didn't see anything wrong with his actions in Afghanistan and "would do it again."
"They were insurgents, they had weapons and they were trying to kill us," Chamblin said. "The same guys were making IEDs and trying to kill Marines. If they could get over here, they would cut off the heads of everybody in this room right now. That's how they are. And you know what? I won that day. They didn't."
On Thursday, Chamblin petitioned for an order of protection against Buckingham, who is currently in Roane County Jail. Her bond is set at $150,000.
"If she makes bond, I and my children will be in danger of repercussions," he stated in an affidavit, according to the Sentinel. "She has threatened me in the past."