But police didn't find him at the house when they arrived.

They did see Vallow and Daybell, who, authorities said, told them Joshua was staying with a family friend in Arizona. When police returned the next day to serve a search warrant, both Vallow and Daybell were gone.

Suspicions grew as authorities learned neither child has been seen since September. Tylee was last seen September 8, when she visited Yellowstone National Park with Joshua, Vallow and her uncle Alex Cox.

Joshua was last seen on September 23, the last time he attended Kennedy Elementary School in Rexburg before his mother told the school she would be home-schooling him, according to a court affidavit.

Questions sprang up: Where were the children? How had they gone so long without anyone hearing from them? Why would their mother take off and where had she gone?

But he also said he did not know where they were.

Deaths around the disappearances

Though police couldn't get answers from their mother, details of events around the children's disappearance quickly began to emerge that raised more questions.

Daybell was also married before. His former wife, Tammy Daybell, died October 19. A few weeks later, he and Vallow were married.

Authorities initially believed Tammy Daybell died of natural causes, but Rexburg police later said her death was suspicious and exhumed her body.

After Vallow and Daybell married, they told some witnesses Tylee had died a year before her father and others that Vallow did not have any young children, police said.

'She thinks she's a resurrected being'

Those close to the couple said that leading up to the deaths and disappearances, they had been involved in strong religious ideologies.

He said their marriage had rapidly deteriorated and that "she thinks she's a resurrected being and a god."

"I don't know what she's going to do with them," Charles Vallow told officers that night, referring to Joshua and Tylee. "I don't know if she's going to flee with them; if she's going to hurt them."

Charles Vallow was killed in the fight about five months later.

Daybell was connected to a religious website called "Preparing a People," which describes itself as a "series of lecture events focusing on self-reliance and personal preparation."

Mother and her husband found in Hawaii

The couple was found in January in Hawaii, where they had been since December 1 as authorities searched for Vallow's children.

"I'll get on my knees and beg," Joshua's grandfather Larry Woodcock said. "Just give me JJ."

Police did not bring charges against either Vallow or Daybell immediately, saying instead their goal was to find the children.

But in February Vallow was arrested, and in March she was extradited from Hawaii. Her bail remains at $1 million and a preliminary hearing is scheduled to begin July 9.

Hagen did not say what charges he may face, but he did say human remains were found on his Idaho property. Those remains have not yet been identified, he said.