The Islamic State militant group released a video Tuesday that it claimed shows the beheading of American journalist Steven Sotloff.
A Clarksville man has pleaded guilty to second-degree murder.
Corey Lanes shot and killed Israel Rivera, an Arizona man who was in Clarksville to visit his daughter, in September 2010.
The case against Lanes' alleged co-conspirator, Levern McQueen Jr., is still pending.
Lanes is facing as many as 20 years in prison. He will be sentenced in April.
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