home. >> kyron! >> reporter: the six-month search, the most expensive in oregon history gone decidedly cold. >> how could anyone successfully hide little boy like that out of the public view and probably the most recognizable missing child in north america? >> reporter: on june 4th, 7-year-old kyron brought to skyline elementary science fair by his stepmother. the last known person to see kyron alive. >> this is something that you never want to happen to anyone. >> reporter: then details that terry leaving facebook updates of going to the gym rather than that her stepson was missing. >> implore terri to fully cooperate with the investigators to bring kyron home. >> reporter: in july, his father claimed terri claimed she failed two polygraph tests and stopped cooperating with police and accused his wife of trying to hire a hitman to kill him in 2009. as the summer wore on, kyron's birth parents celebrated the 8th birthday without his son. >> i don't know what else to do. >> reporter: the desperate app

since kyron went missing and we're still deeply saddened he's not home with us. his step-mother was apparently the little boy never showed up for class. >> six months, again is a long time for the community. it's really affected everybody. but in the investigation, six months is not that long of a time. >> reporter: law enforcement and volunteers have searched repeatedly for any sign of the boy over the past several months. the most recent search was here on this quiet island, about 15 minutes from kyron's elementary divers scoured the waterways about be a month ago, an amnous sign, perhaps, authorities may not believe the little boy will be found alive, adding to mounting despair. already, the investigation is estimated at $2 million, the most costly in oregon history. there remains a core team of 11 the grand jury investigation is also ongoing but there have been no indictments, no arrests and, despite the suspicion surrounding his step-mother, terri, no one has even been named a person of interest. >> the most significant thing that's come out of this, three o