Trial is under way for an eastern Kentucky man charged with killing his niece and her husband.

According to WYMT-TV in Hazard, attorneys said there had been an escalating disagreement over property that ended with the March 2008 shooting that killed 47-year-old Alan Keith Tackett and his 30-year-old wife, Lisa Lynn Tackett outside their home in Floyd County.

The defense claims Berry Hall was mentally ill at the time of the shootings, being depressed because he had been unable to find work. His attorney said Hall's intelligent quotient is in the borderline intellectual functioning range.

Among government witnesses against Hall on Monday were his sons.

The commonwealth is seeking the death penalty if a jury convicts Hall.

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