Two years after John Zera was murdered, an anonymous tip about a Franklin High substitute teacher with an unusual interest in boys' feet would generate a new prime suspect.

For more information on the true crime series Unsolved: A murder mystery podcast, visit http://usatoday.com/unsolved.

For more reporting on cold cases, unsolved cases and true crime detectives, as well as additional true crime stories and investigative journalism visit witness.usatoday.com. Crime reporter and investigative reporter Gina Barton is also host of Untested: A true crime podcast, in which Annie Harrison joins the rank of true crime detectives as she solves the cold case of a possible serial rapist. Subscribe to Untested: A true crime podcast at https://art19.com/shows/untested

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