IT’S been a huge week for micro-penises — especially those belonging to psychopaths.

First, it was revealed that DNA evidence has shown that Hitler may have had a miniature soldier, and now a new book claims that the “Golden State Killer” — the infamous serial killer who was famously caught with the help of Michelle McNamara, the wife of Patton Oswalt — may only have been caught because of his shrunken schwanz.

Page Six got a sneak peak at Sacramento DA Thien Ho’s new tome, “The People vs. the Golden State Killer,” and Ho writes that the nominal knob was the detail that made detectives connect multiple sets of crimes to the same perp, Joseph James DeAngelo Jr.

DeAngelo had been arrested on suspicion of several brutal crimes around California, but cops believed he might also be responsib

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