PORTLAND -- Kyron Horman's stepmother is adding a new face to her legal team; Attorney Mark Wagner will help defend Terri Horman in a civil lawsuit.

Wagner, from the Portland law firm Hart Wagner, specializes in civil defense work. According to his staff, Wagner was out of the country Monday and not available for comment.

Divorce attorney Peter Bunch and criminal defense lawyer Stephen Houze will also continue to represent Terri Horman.

Background: Kyron Horman's mother sues stepmother for $10 million

The missing boy's mother, Desiree Young is suing Terri Horman for $10 million. Young claims Terri Horman is to blame for her son's disappearance. The second-grader was last seen at Skyline School on June 4, 2010.

The family marked his 10th birthday with an awareness event Sunday.

Kyron's father Kaine Horman confirms he has been called to testify in an upcoming deposition. No trial date has been set in the civil suit.

Complete coverage: The search for Kyron Horman

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