The mother of an Oregon boy who vanished three years ago has dropped her lawsuit against the child's stepmother, saying the case can't move forward without information the police won't release because of the ongoing investigation.

Desiree Young filed the $10 million suit again Terri Horman last year, alleging the stepmother kidnapped Kyron Horman. She asked the court to order Terri Horman to return Kyron or say where his body is.

Young announced her decision to withdraw the lawsuit Tuesday after a hearing before a Multnomah County judge.

Kyron Horman was 7 when he disappeared from his Portland school in June 2010. No arrests have been made.

Horman hasn't commented on Young's allegations.

Young urged her to cooperate Tuesday, saying "I cannot tolerate the continued silence." Despite withdrawing the suit, she says her determination to find her son has only strengthened.