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A forensic scientist who testified during Lori Vallow Daybell's ongoing murder trial revealed that fingerprints were found on a piece of plastic that was recovered with Lori's

son's remains. On Thursday, Tara Martinez, a forensic scientist with Idaho State Police, testified that she tested plastic and duct tape that were found with 7-year-old Joshua

"J.J." Vallow's remains and found a usable print on a piece of the plastic, _East Idaho News_ and KTVB report. The print matched Lori's brother Alex Cox and another

latent fingerprint matched Cox's palm, according to Martinez, the outlets report. In June 2020, the remains of Lori's children Tylee, 16, and J.J. were found buried on an Idaho

property that belonged to Chad Daybell, Lori's fifth husband. Cox has always been a central figure in the investigation into what happened to Tylee and J.J., who were last seen in

September of 2019. Cox's cell phone records allegedly placed him at the property where the children's remains were found on two dates that aligned with the last time they were

seen. Cox died on Dec. 12, 2019 at 51 years old of what authorities have said were natural causes. Lori is charged with murder in connection with the deaths of J.J. and Tylee and conspiracy

to commit first-degree murder in the death of Chad's first wife Tammy Daybell. Yesterday, J.J.'s cause of death was revealed. Dr. Garth Warren, a forensic pathologist, said during

the trial that J.J. was asphyxiated with a plastic bag and duct tape over his mouth, according to _East Idaho News_, KTVB reporter Alexandra Duggan and Fox 10. Tylee's cause of death

was undetermined, Warren said, according to _East Idaho News_, KTVB and CBS2 Boise reporter Angela Kerndl. Warren also said Tylee's autopsy took longer than J.J.'s because her

remains were not found intact. "What was left of Tylee was found. Charred remains. A mass of bone and tissues. That was what was left of this beautiful young woman," Fremont County

Prosecuting Attorney Lindsey Blake said during the first week of trial. "Her DNA was discovered on a pickaxe and shovel and later found in Daybell's shed." Blake also

revealed during opening statements that Tammy's cause of death was asphyxiation. Tammy, 49, died in October 2019 — weeks after Lori's children disappeared and weeks before Lori and

Chad got married in Hawaii. Chad is charged in connection with the deaths of Tylee, J.J. and Tammy, but will be tried separately. He has pleaded not guilty. Lori's trial is ongoing.

_If you suspect child abuse, call the Childhelp National Child Abuse Hotline at 1-800-4-A-Child or 1-800-422-4453, or go to www.childhelp.org. All calls are toll-free and confidential. The

hotline is available 24/7 in more than 170 languages._ * WITH REPORTING BY CHRISTINE PELISEK