Diona Maria Peterson was 4 years old when she was taken from Santa Ana, California, on October 4, 2005. The abductor was her non-custodial mother, Mika Mochizuki, who was involved in a custody dispute and is believed to have taken Diona to Japan. An FBI warrant for unlawful flight to avoid prosecution was issued for Mika in January 2007. Mika was born in Tokyo, had family there, and may be using the name Mika Maria Peterson; authorities believe she and Diona remained in Japan.

Diona is of Asian and Caucasian descent, had light brown hair and hazel eyes at the time, and spoke English and Japanese. She may use the last name Mochizuki. Despite international efforts and release of age-progressed images, Diona’s whereabouts remain unknown and the case is open. Anyone who knew Mika or Diona, or who may have seen them in Japan or elsewhere, is asked to contact investigators with information.