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But prosecutors have said they might call Avery to the witness stand. At his March plea hearing, he admitted to sexually assaulting Billy and conspiring with Lynn and others to cover it up. He got a relatively light 2½ to five years in prison.

Lynn’s lawyers, in a post-trial motion, said a defense polygraph had cleared Avery of assaulting Billy. They argue that Avery never met the boy but took a sweetheart deal to avoid being prosecuted for abusing other children.

Prosecutors, in court papers, have stood by the integrity of Avery’s plea.

And Mr. McLaughlin, Billy’s civil lawyer, has called the plea “proof positive” that his client’s claims are true.