Operation Resolute Support said in a news release Saturday it is investigating the incident, which is suspected of being carried out by a member of the Afghan National Defense and Security Forces.
Brent Taylor, the mayor of North Ogden, was killed in an attack perpetrated by a member of the Afghan National Defense and Security Forces in the capital city of Kabul. Another U.S. service member is being treated for wounds sustained in the attack, American military officials said.
USA officials added that the incident is under investigation.
"We are devastated by the loss of our mayor and friend, Brent Taylor", according to a statement on the North Ogden City Facebook page.
Brent Taylor, had taken leave from his position to serve with the Utah National Guard in Afghanistan and had been part of an advisory team training staff in an Afghan commando battalion in Kabul.
Taylor became mayor of North Ogden, a city of about 17,000 people 46 miles north of Salt Lake City, in 2013. "We feel blessed to have had him as our mayor".
The Utah National Guard has not publicly confirmed or discussed the circumstances of Taylor's death, which was confirmed to CNN by a government official.
Taylor's last Facebook post touched on how inspired he had been by the elections in Afghanistan, as he encouraged people in the United States to vote on Tuesday. Another soldier from the SFAB was killed in July, also in an insider attack.
Utah Gov. Gary Herbert plans to hold a news conference on Sunday to discuss the death. Gen. Jeffrey Smiley, was wounded in an "apparent insider attack" in Afghanistan.
Just last month, an insider attack where Gen. Scott Miller, the top USA commander in Afghanistan, was present, killed a key Afghan general and wounded an American one-star general.