Two other Task Force Lightning soldiers were wounded in the attack in Diyala province, the military said.
The statement did not provide more details or give the nationality of the journalist who died.
A roadside bomb also killed a Multi-National Division — Baghdad soldier and wounded another in southern Baghdad on Sunday, the military said separately.
Another Multi-National Division — Baghdad soldier was killed and two wounded when their vehicle was struck by two roadside bombs north of the capital on Sunday, the military said.
Two Marines assigned to Multi National Force — West were killed Saturday while conducting combat operations in Anbar province, a Sunni insurgent stronghold west of Baghdad, the military said.
A roadside bomb killed a Multi-National Division — Baghdad soldier and wounded four others Friday in western Baghdad, the military said separately.
In an attack reported earlier, a Task Force Marne soldier was killed and two others wounded Friday when their patrol was struck by a roadside bomb south of Baghdad.
A Task Force Lightning soldier also died Sunday in a non-combat related incident, the military said. It provided no more details but said the incident was under investigation.
Identities were not released pending notification of relatives.
The deaths raised to at least 3,373 members of the U.S. military who have died since the Iraq war started in March 2003, according to an Associated Press count.