Jurors will next deliberate on whether Naeem Williams should be sentenced to death or life in prison with no possibility of release for killing his 5-year-old daughter.
That phase of the trial begins Wednesday and will include a new round of opening statements and evidence.
The same jury last month convicted Williams in his daughter Talia's 2005 beating death. The drawn-out case has gained attention in part because it involves a capital offense in a state that doesn't have the death penalty.
Hawaii's territorial government abolished capital punishment in 1957, before Hawaii became a U.S. state in 1959. But Williams was tried in the federal system which allows for the death penalty because the crime occurred on military property.
Lawyers for both the prosecution and defense declined comment Friday after the jury's eligibility decision was read.
Williams' defense team argued he was not eligible for a death sentence because of his low IQ. Mental health experts testified about intellectual impairments and low test scores.
The prosecution contended factors such as Talia's age and vulnerability made the killing so heinous that the death penalty was warranted.
Jurors decided Williams met all key conditions to be eligible for the death penalty: He was an adult; his actions were intentional that resulted in the girl's death; and the crime was especially heinous and the victim was vulnerable because of her youth.
One juror appeared to cry as jurors were polled.
Williams and Talia's stepmother, Delilah Williams, testified during the guilt phase of the trial that they beat her almost daily with hands and belts during the seven months she lived with them in Hawaii.
Naeem Williams blamed the beatings on the child's bowel- and bladder-control issues, coupled with frustrations he faced in his marriage.
His wife, Delilah, testified against him as part of a deal with prosecutors for a 20-year sentence. She provided graphic and disturbing details of abuse that included withholding food from the girl for days at a time, beatings while the child was duct-taped to a bed, pulling her so hard by the hair that she was left with a bald spot, and stomping on her until bone cracked.
The couple eventually took the kindergartner out of school so that others wouldn't see the signs of abuse on Talia's body.
Prosecutors say she died on July 16, 2005, after her father dealt a blow so hard it left knuckle imprints on her chest. Naeem Williams said he beat the girl that day partly because of toothpaste she spit onto the bathroom sink.
The resolution of the case also paves the way for Delilah Williams' sentence. Her public defender, Alexander Silvert, requested that she be immediately sentenced and moved to a mainland prison after she testified, satisfying terms of her plea deal.
But U.S. District Judge J. Michael Seabright ruled that Delilah Williams must wait until jurors in Naeem Williams' trial have been dismissed before she can be sentenced.