FILE - This combination of undated file photos released by the National Center for Missing & Exploited Children show missing children Joshua Vallow, left, and Tylee Ryan. Chad Daybell was taken into custody Tuesday, according to police in the small town of Rexburg. The attorney representing both Chad and Lori Daybell, Mark Means, did not immediately respond to a request for comment. Lori Daybell has pleaded not guilty to the charges against her and Chad Daybell has not been charged in connection with the case. Law enforcement officers first searched Chad Daybell's home on Jan. 3, removing more than 40 items including several pieces of computer equipment.

An Idaho man and woman are being sought for questioning after the man's previous wife was found dead and weeks earlier his two stepchildren were reported missing. Investigators are now looking to question her husband, Chad Daybell, who police say married another woman, Lori Vallow, weeks after the initial death. Vallow's two children -- Joshua Vallow, 7, and his sister Tylee Ryan, 17 -- have not been seen since September, according to police. After family reported they had not spoken to Joshua since September, police said they conducted a welfare check on November 26. After determining that Joshua wasn't with a family friend, police returned the next day to execute a search warrant on the home.