Four defense mental health experts have testified in U.S. District Court that Naeem Williams has limited planning, problem-solving and adapting skills and is in or just outside the range of intellectual disability, formerly known as mental retardation.

None of them, however, has told the jurors how those intellectual impairments make Williams ineligible for the death penalty.

The jury is tasked with determining whether the former Schofield Barracks soldier can be executed.

U.S. District Judge J. Michael Seabright found in March that the defense team did not convince him that Williams is mentally retarded; Williams was therefore eligible to stand trial for a death penalty offense.

The jurors found Williams guilty last month of capital murder for the July 16, 2005, beating death of his 5-year-old daughter, Talia, through child abuse and as a result of months of assault and torture. To find him eligible for the death penalty, they must find that Williams acted with intent and that there is at least one aggravating factor.

Williams was a 25-year-old Army specialist when he killed his daughter.

Federal prosecutors say Williams intentionally inflicted serious bodily injury on Talia. They say the killing was done in an especially heinous, cruel and depraved manner and Talia was particularly vulnerable due to her young age.

Defense lawyers told the jurors that because of Williams’ intellectual impairments, he lacks the mental capacity to satisfy the intent element and one of the aggravating factors.

Williams had his IQ tested in 2006, 2009, 2010 and twice in 2013.

Psychiatrist Dr. Pablo Stewart testified that Williams’ scores put him just outside the range for intellectual disability but places him in the borderline intellectual functioning range.

Neuropsychologist Joette James administered one of the tests in 2013 and said Williams’ score puts him “in the range associated with an intellectual disability.” She also said Williams has deficits in several intellectual functions, including working or short-term memory, organization and the speed at which he can take in information.

Kyle Boone, another neuropsychologist, said she checked all the IQ test results to look for malingering or faking on Williams’ part.

“The available evidence indicates that he was in fact performing to his true ability,” she said.

Neuropsychiatrist Dr. George Woods said he interviewed Williams and reviewed all the tests and available reports and determined that “Mr. Williams does meet the criteria for mild intellectual disability.” He also said Williams has problems with processing speed and to effectively weigh and deliberately sequence his behavior and respond appropriately to social cues to something that is of benefit to him — in other words, “to get the big picture.”

If the jurors determine that Williams is not eligible for a death sentence, he will spend the rest of his life behind bars. If they find him eligible, they will move on to the next phase of the trial to determine whether Williams should be put to death.