As such, he featured prominently in helping solve the series' first 22 mysteries. Eventually, the team discovers how the bombs were planted in the lab and then learns that Kovac's wife built the bombs. At the end of Season 11, Zack comes back as a suspect, as a serial killer called The Puppeteer is believed to be Zack, but is ultimately revealed to be his psychiatrist, Dr. Mihir Roshan. //

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