Texas EquuSearch says the groups found will be in Orlando Thursday morning to join the search for Michelle Parker.
However, Miller told reporters that he was not expecting a happy outcome.
"I mean, it's -- I'm going to say it's fairly obvious that she's not alive," Miller said. "This is not going to be one of the miracles like Elizabeth Smart where she's going to show up."
Miller's search teams have handled other high-profile cases, including Caylee Anthony and Natalee Holloway, who disappeared in Aruba.
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