They remain intently focused on the boy's stepmother, reportedly the last person to see the child alive, say the investigators in the case of a missing Oregon boy.

The (Portland) Oregonian has reported that police working the case of Kyron Horman, who disappeared June 4 from a Portland elementary school, searched the condo of DeDe Spicher, a friend of stepmother Terri Horman, seizing a phone and computer, and have interviewed Michael Cook, whom court records say Horman was "sexting" days after her husband, Kyron's father Kaine Horman, filed for divorce.

Authorities have said that Terri Horman drove Kyron Horman to school, toured a school science fair with him and reportedly said goodbye to him about 8:45 a. m. He was reported missing in the afternoon when he didn't return home on the school bus.

They want to question Spicher regarding her whereabouts June 4 during a 90-minute period when she abruptly left her gardening job at a Northwest Portland home and couldn't be reached by cellphone, prosecutors have said.

The Multnomah County Sheriff's Office said last week's doubling of the reward for information leading to Kyron's whereabouts has spurred a flurry of calls.

It has also been reported that in the course of the investigation, authorities say a landscaper told them Terri Horman asked him to kill her husband about six to seven months before Kyron's disappearance.

The Oregonian further reported that investigators informed Kaine Horman of the allegation June 26, prompting him to leave the house with their daughter, Kiara, and file for divorce and a restraining order against Terri Horman two days later. (With Inputs from Agencies)