The announcement was made Wednesday morning during a press conference in Springfield.
Police say they have not been able to confirm the body is that of Hailey Owens. An Amber Alert was issued Tuesday for Owens.
Craig Michael Wood, 45, is in police custody on suspicion of murder charges, but is not cooperating with police.
Wood was employed by the Springfield School District.
Police say witnesses to Owens' abduction alerted them with a license plate number that led them to Wood.
The body was found inside Wood's home.