The father of missing 7-year-old Kyron Horman asked Monday that the boy's stepmother be held in contempt of court for sharing with an alleged lover a restraining order in which the father says he believes the stepmother was involved in the boy's disappearance.

PORTLAND — The father of missing 7-year-old Kyron Horman asked Monday that the boy's stepmother be held in contempt of court for sharing with an alleged lover a restraining order in which the father says he believes the stepmother was involved in the boy's disappearance.

The motion filed by Kaine Horman is the latest twist in a more than monthlong investigation that has focused attention on the actions of his wife, Terri Moulton Horman.

Last week a judge unsealed a restraining order against Terri Horman in which Kaine Horman said he believes she is involved in Kyron's disappearance and also alleges that she plotted to have Kaine Horman killed late last year. Police have not said Terri Horman is a suspect but have been focusing attention on her.

Kaine Horman sought the restraining order after moving himself and their 18-month-old daughter, Kiara, out of the Horman home late last month. He has also filed for divorce.

In the new motion filed by Kaine Horman, he accuses Terri Horman of sharing the still-sealed restraining order with a man she had begun having a sexual affair with after Kaine Horman moved out of the house.

He asks that Terri Horman be fined and possibly jailed for contempt of court for showing the restraining order to a Michael Cook, identified in the motion as a high school acquaintance of Kaine Horman.

Kaine Horman said he believes his wife did not know Cook until after Kyron's disappearance on June 4.

Kaine Horman said Cook has told investigators that Terri Horman let Cook use his cell phone camera to photograph the restraining order, including the address of Kaine Harmon's new residence. The restraining order was unsealed last week, but a judge directed Kaine Horman's new address to remain sealed.

According to Monday's filing, Cook then searched the Internet for directions from Terri Horman's house to Kaine Horman's undisclosed temporary residence.

In the filing, Kaine Horman also said that on the same day Terri Horman was served with the restraining order — but before she was served — she showed up at a gym where he works out. The gym also has a daycare center. Kaine Horman said Terri Horman asked the clerk at the gym to let her know if Kaine Horman came to the gym with Kiara, the couple's daughter. The clerk told the manager about Terri Horman's visit to the gym, and the manager informed police.

In the filing, Kaine Horman accused Terri Horman of going to the gym looking to "abduct" their daughter.

Terri Horman's attorney, Stephen Houze, did not return calls to The Associated Press.

Kaine Horman said in the filing that Cook has provided investigators with information about his relationship with Terri Horman, including "hundreds of text messages as well as several photographs of (Terri Horman) in various stages of undress and graphic sexual activity."

Kaine Horman's attorney said in the filing that Terri Horman's "stated personal relationship concerns and sexual overtures to Mr. Cook resemble those made to the man (Terri Horman) previously attempted to hire to murder (Kaine Horman)."

Also on Monday, Houze filed a court motion stating that Terri Horman would abide by a request by Kaine Horman that she move out of their house. Kaine Horman has said he wanted his wife out of the house because of the alleged murder plot and because he said he thinks she is involved with Kyron's disappearance.

Kaine and Terri Horman were married in April 2007. Terri Horman also has a teenage son from the first of two previous marriages.