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New court documents reveal what led to the discovery of JJ Vallow, Tylee Ryan

Investigators used cell phone tracking to narrow down where to dig for the childrens' bodies

REXBURG, Idaho — Note: This story has graphic content. 

Newly unsealed court records are revealing how investigators found JJ Vallow and Tylee Ryan’s bodies, found buried on their step-father’s property in Idaho last week.

Records show it was pings from Alex Cox’s cellphone that lead investigators to the children's gruesome graves.  Cox is the children's uncle, Lori Vallow Daybell's brother.

Court records say Alex Cox’s cell phone puts him on Chad Daybell’s property for long periods of time the day after Tylee disappeared last year and also after the day after JJ disappeared later that month.

Records reveal that one body was dismembered - the head separated from the rest of the body, all wrapped in plastic and duct tape.

The other body was found in a pet cemetery near a fire pit. Investigators say they found bones and tissue, some of them charred.

Investigators first started looking at the Daybell property after a neighbor noticed more bonfires in the backyard.

Tylee Ryan was last seen at Yellowstone National Park on September 8, 2019. The next day, Chad Daybell, texted his then-wife Tammy:

"Well, I've had an interesting morning! felt should burn all of the limb debris by the fire pit before it got too soaked by the coming storms. While did so, spotted big raccoon along the fence. hurried and got my gun, and he was still walking along. got close enough that one shot did the trick. He is now in our pet cemetery. Fun times!"

In the records, investigators note the messages were weird.

Tammy died suddenly at the same home in October.  Her death still under investigation.

The documents also shed light on why the children might be dead.

Lori’s close friend, Melanie Gibb, told police Lori thought both kids had turned into zombies that were hard to handle and that Chad put the idea in her head.

The records say Gibb also told police Lori believed that once a person was possessed by a zombie, their true spirit goes into a limbo where it’s stuck until the body is killed.

"These doctrines are dangerous," Gibb told East Idaho News last month.  "And look what they lead to. They lead to people dying."

At this point, there are no charges tied to the children’s deaths but more charges are expected as the investigation continues.

As for Alex Cox, he died at his home in Gilbert in December 2019.  The medical examiner ruled he died from natural causes, but police say the investigation is still open.

RELATED: Chad Daybell pleads not guilty after bodies of JJ Vallow, Tylee Ryan found on Idaho property

Among other things listed in the probable cause statement unsealed Friday:

  •  One of the sets of remains was found buried on the Daybell property, wrapped tightly in plastic and buried under a layer of paneling under a layer of sod. The location corresponded with the cell-phone location of Lori Vallow's brother, Alex Cox, in September. Cox later died of natural causes.
  • The morning after Joshua "JJ" Vallow was last seen alive, his mother told a family member that he was "acting like a zombie" and had been crawling on the kitchen cabinetry during the night, knocking a picture of Jesus off the refrigerator. When the family member asked where JJ was, Vallow responded that his uncle, Cox, had taken him. 
  • The FBI tracked Cox's cellphone's locations for the day after JJ disappeared. He was back on Daybell's property, near the pond, where they later found the second set of remains. 

RELATED: 'She needs some serious help': Gilbert body camera video shows Charles Vallow pushing for Lori Vallow's mental health check in 2019

RELATED: Emotional memorial held in Gilbert for Tylee Ryan and JJ Vallow

You can read the full probable cause statement below: