Is the situation with Bill Tench's son based on a true story?

(Some great spoilers coming for Season 2 of "Mindhunter" on Netflix)

Season 2 of "Mindhunter" on Netflix diverts a bit of attention from Holden Ford (Jonathan Groff). While Season 1 has spent a lot of time looking into her personal life, including her relationship with Debbie (Hannah Gross), Season 2 gives this treatment to her partners in the FBI's Behavioral Sciences Unit, Dr. Wendy Carr (Anna Torv) and Bill Tanche (Holt McCallany). And that's the story of Bill's family going through, which is perhaps the biggest impression of this year.

For Bill, his personal story revolves around an incident with his son Brian (Zachary Scott Ross), who threatens to tear the Tench family. Early in the season, the corpse of a young child is found in a house sold by Bill's wife, Nancy (Stacey Roca), who started working as a real estate agent. After a rather short investigation, the local police discovered that the toddler had been accidentally killed by local boys – and Brian was present at the scene.

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Brian, being so young and not involved in the incidental killing, is not charged with a crime or sent to juvenile detention. But a social worker is suing the Tench family for the rest of the season and needs to see a child psychiatrist every week. Bill spends every episode asking himself clearly if Brian will become the kind of serial killer he faces in his career.

"Mindhunter" is a fascinating turn of events, which adds a layer of layers to Bill as a character. But there is one big question that will be of great concern to many viewers as we watch Season 2 unfold: is all this with Brian based on a true story?

"Mindhunter" is an interesting beast because it is basically an adaptation of real events – while Holden, Wendy and Bill are fictional versions of real characters. Bill Tench is based on the real Robert Ressler of the BSU. Although Ressler had three children – a son and two daughters – Bill has only one. And no, as far as we know, Ressler's son, Aaron, did not witness the murder of a toddler. In fact, I have not been able to find a concrete example in which one child is murdering another which corresponds to what happened in "Mindhunter".

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So, yes, all this incident with the Tench family is original for the series. And, in my opinion, this is a welcome addition, as it contains so many new texts and sub-texts to be taken into account as our heroes continue to try to break the spirit of serial killers. And that makes Bill Tench an even more interesting character than he was in season 1 of "Mindhunter". I can not wait to see where they will take this thread in the coming seasons.