The potential serial killer investigation involving gruesome images discovered at the home of a dead pornographer could take a much darker turn if it turns out the sadistic images were being distributed to a wider network, according to a prominent police and forensic psychologist.

Raymond “RC” Horsch, an 82-year-old who produced brutally themed pornography and books, died last year. But after his son Eugene Horsch, 44, was arrested in June on charges involving unlawful firearms and forgery, police made a series of unsettling discoveries at the family home on Chew Avenue in Philly’s Olney neighborhood.

There may very well also have been a…

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