It appears the Golden State Killer was caught because of a very tiny physical feature.

According to a new book written by Sacramento, Calif., district attorney Thien Ho, it was the small penis of Joseph James DeAngelo Jr. that helped cops link him to many crimes.

The book, The People vs. the Golden State Killer , outlines how cops believed DeAngelo, who was arrested on suspicion of crimes around California, might have also been a suspect they named the “East Side Rapist.”

DeAngelo was believed to have killed at least 12, sexually assaulted more than 45 people and burglarized hundreds of homes in California in the 1970s and 1980s. For his crimes, DeAngelo was nicknamed the Golden State Killer.

Ho wrote that victims of the sexual assaults all described the suspect as having a small man

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