Kyron Horman's Parents' Plea: 'Come Home'

June 25, 2010 — -- The parents of missing Kyron Horman appeared on national television for the first time today to issue an emotional plea for the 7-year-old Oregon boy to "come home."

"Honestly it's a parent's worst nightmare," Kyron's mother, Desiree Young, told "Good Morning America." "We've racked our brains trying to think of reasons why. We cannot come up with anything... It's like a portal opened up in the school and Kyron just vanished into it. It's a mystery."

Young choked up when she tried to give her missing son the message that she and Kyron's father, Kaine Horman, "love you and we need you to come home."

Young described her boy as very timid and not prone to adventure.

"He also can't see very well so he tends to stick very close to home. He doesn't go outside a certain parameter... He doesn't wander off. It's not his personality type," Young said.

Police called off major search operations last week and seemed to focus their attention on Kyron's stepmother, Terri Horman, who was reportedly the last person to see Kyron alive when she dropped him off at school. Terri Horman has not been named a suspect or person of interest in the disappearance.

Kyron's biological parents were told by authorities not to discuss details of the investigation and are in constant contact with police and are doing everything they can -- including their appearance on "GMA" -- to help find the boy.

"It's important to keep Kyron's face out there so everybody sees him so hopefully someone will see him and recognize him and report that tip that we're waiting for to bring him home," Young said.

Police Interested in Kyron's Stepmother, Terri Horman

Last week investigators asked some very specific questions about Terri Horman's movements on the day the boy went missing -- and one of her friends told ABC News that Terri Horman was given a polygraph test.

Police began describing the case as a criminal investigation earlier this month. They have but since said they do not believe anyone else in the Oregon community is in danger, causing some to speculate that police may have had a suspect in mind, likely someone who knew Kyron.

"They've already said, 'Relax, we don't think there's someone out there that's going to snatch your kid. We think this is an isolated incident,'" C.W. Jensen, a retired police captain and former homicide investigator, told "GMA" last week. "They've already told us volumes."

Police collected a questionnaire they sent out to the community in which they asked if anyone saw Terri Horman or the white truck she was driving on the day Kyron disappeared.

"Clearly, they need more information about what she did that day, where she was that day, and that's why they put this out," Jensen said.

Multnomah County Sheriff's Capt. Jason Gates said last week Terri Horman is "being cooperative with investigators. The whole family is being cooperative with investigators."

Through the ordeal, the family has remained mostly out of view, rarely appearing in public and only once appearing together to read a statement.

"You mean everything to us," said Tony Young, Kyron's stepfather, that day. "And until you come home, this family's not complete. Please, Kyron, keep up the hope."