The mother of Kyron Horman, a missing Portland, Ore., boy, filed a $10 million civil lawsuit Friday against Terri Horman, Kyron's stepmother, in connection with the boy's disappearance two years ago, NBC station KGW reported.

Desiree Young's lawyer, Eldon Rosenthal, said at a Friday news conference covered by KGW that the statute of limitations for filing a civil lawsuit in the case was two years. Monday, June 4, will be the two-year anniversary of Kyron Horman's disappearance from Skyline Elementary School.

The lawsuit asks the court to compel Terri Horman to disclose Kyron's location, KGW reported. It also includes two claims, one for custodial interference and one for intentional infliction of emotional distress.

See the original story at KGW of Portland, Ore.

Terri Horman's attorney, Stephen Houze, told KGW he would not make any public statements regarding the suit until he has thoroughly reviewed the filing.

Rick Bowmer / AP

Desiree Young, the mother of Kyron Horman, stands on the steps of the Portland Justice Center on Friday after filing a $10 million civil lawsuit against Kyron's stepmother.

Rosenthal said the lawsuit would enable him to subpoena witnesses, acquire documents and evidence and "peel away the mystery" of what happened to Kyron.

"My family and I are living through a nightmare that most families cannot even imagine," Young said, tearfully reading a prepared statement. "My Kyron has always been my comfort and my joy. I will forever have a hole in my heart because he's not here."

Multnomah County Sheriff / AP

Kyron Horman vanished after his stepmother left him at his Portland, Ore., elementary school.

"I haven't been able to see my son, hug him, kiss him or tuck him into bed" in nearly two years, she said, according to KGW. "Not a day goes by that I don't think of him.

Kyron disappeared two years ago from Skyline grade school, leading to the largest search effort ever conducted in Oregon.

Terri Horman was the last person to see Kyron alive, investigators said. Horman has retained a lawyer for nearly two years and has refused to talk with detectives, who told KGW that they are still pursuing the case.

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