Prosecutors are evaluating whether to pursue a retrial for a U.S. Border Patrol agent on manslaughter charges after an Arizona jury deadlocked on the lesser counts.
A mistrial was declared Monday in the case of Agent Lonnie Swartz.
Tucson jurors acquitted him of a second-degree murder charge in the 2012 shooting death of a teenager from Mexico.
The decision means prosecutors could seek another trial for Swartz on the manslaughter charges in the death of Jose Antonio Elena Rodriguez.
The teen was fatally shot as he threw rocks at authorities during a drug smuggling attempt.
Swartz fired 16 shots late through a 20-foot fence that sits on an embankment above Mexico's Calle Internacional, a Nogales street lined with homes and small businesses.
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