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A member of the Navajo Nation pleaded guilty Monday to involuntary manslaughter in the shooting death of a fellow tribal member in 2011.

Philbert Rentz, 29, admitted in a federal court plea agreement that he acted "recklessly with extreme disregard for human life" in the murder of Tedrick Francis, 33.

The plea agreement contains a proposed sentence of six to eight years in prison. Rentz had been facing 10 charges, including first degree murder, assault and unlawful possession of a firearm.

He earlier had pleaded guilty to illegal possession of a firearm by a convicted felon.

The crimes stem from a July 23, 2011, episode where Rentz was a passenger in a pickup truck driven by Llewellyn Dee Benally that stopped in a Utah section of the Navajo Nation. An argument ensued when two men approached the truck and Benally then pointed a rifle at them.

Rentz then fired a shot that went through one man and killed Francis.

Benally was sentenced to two years in prison after pleading guilty in May 2012 to being a felon in possession of a firearm.

The pair were prosecuted in federal court because the crimes took place on an Indian reservation.