A Saturday statement by the Resolute Support Mission said that two other USA service members were wounded but in stable condition.
A US service member has been killed and two others were wounded in an "apparent insider attack" in southern Afghanistan on Saturday, according to North Atlantic Treaty Organisation.
The Pentagon has identified the soldier killed in an apparent insider attack Saturday in Afghanistan as Army Cpl.
US Army Col. Scott Jackson, the Security Force Assistance Brigade's commander in Afghanistan, told reporters last month that insider attacks were a threat but that US forces were taking necessary precautions.
No further details have been given regarding the incident and exact location where the attack took place but North Atlantic Treaty Organisation said the incident is under investigation.
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The statement did not provide further details, saying that the name of the US service member killed in action would be withheld until notification of next of kin.
This is the third combat fatality in Afghanistan this year. The Afghan province that has seen the highest number of attacks is Helmand to the south, a Taliban stronghold and the heart of Afghanistan's opium-growing industry.
O'Donnell told RFE/RL in an e-mail that the soldier killed in the July 7 incident was the third US service member to have died in Afghanistan this year.
An insider attack would indicate one carried out by a member of the Afghan security forces. The last insider attack that resulted in a U.S. casualty occurred two months earlier, in June of past year.