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Chad Daybell, the new husband of Lori Vallow, was arrested after human remains were unearthed at his Idaho property.

Vallow is the mother of 2 children, Joshua Vallow, 7, and his sister, Tylee Ryan, 17, who have been missing since September. She was arrested in Hawaii in February and extradited to Idaho where she is being held on $1 million bail.

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Daybell was arrested Tuesday on suspicion of concealing or destroying evidence after police in Idaho executed a search warrant at his home in Fremont County.

"During the search of the property, investigators found what appears to be unidentified human remains," chief of police Gary Hagen said.

Vallow and Daybell fled to Hawaii last year after police and federal agents in Idaho questioned them repeatedly about the location of the children.

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Vallow missed a court-ordered deadline to bring the children to the Rexburg Police Department in Idaho.

Tylee and Joshua were last seen in September 2019, according to police. Surveillance cameras at an Idaho storage facility showed Vallow and Daybell removing heavy items from a storage unit.

Police served a search warrant on the storage unit, but did not disclose if any evidence was found.

The case has frustrated law enforcement who believed the children were deceased.

At least 5 people -- including Vallow's ex-husband, Charles, and Daybell's wife, Tammy -- have died under suspicious circumstances in Vallow's inner circle.

Tammy told police that a man fired several shots at her in the weeks before she died mysteriously in her sleep.

Vallow and Daybell married 2 weeks after Tammy's death. Tammy's body was exhumed by police. Toxicology results are pending.

Vallow's first husband, Charles, was shot and killed by her brother, Alex, on July 11, 2019. Alex claimed he shot Charles in self-defense. Vallow was at home at the time of the shooting. She corroborated the story that her brother gave police.

Alex mysteriously died on December 11, 2019 of unknown causes.

Vallow and Daybell are cult members who were preparing for the second coming of Jesus in July 2020.

Tylee was preparing to return to college at the time of her disappearance. Joshua, who was adopted, was diagnosed with autism.