A county prosecutor says the adoptive parents of an 11-year-old boy who has been missing for nearly a decade are suspects in his disappearance and could face murder charges.

Butler County Attorney Jan Satterfield says no human remains have been found in the search for Adam Herrman, but there's still a chance for first-degree murder charges, with the underlying crime being child abuse.

"They are the suspects in this case," Butler County Attorney Jan Satterfield said of Doug and Valerie Herrman.

Satterfield told The Wichita Eagle that although investigators haven't ruled out the possibility that Adam — who would be 21 now — is alive, they have found "no indication that he exists out there."

Adam was a toddler when he came to the Herrmans, who later adopted him.