What Truly Was the First “Slasher Film”? – Part 2 of 4

Horror movie geeks, by and large, tend to possess at least some degree of fondness for the slasher genre. You can’t deny the likes of Halloween or A Nightmare on Elm Street, nor the lasting psychological impact they had on a generation of 1970s and 1980s moviegoers. Even today we’re awash in sequels to some of these franchises—there are, after all, still two more upcoming Halloween films, more than 40 years after John Carpenter unleashed the definitive American slasher on unsuspecting audiences. The idea of this genre has proven as unkillable as its most famous villains, even after periods of dormancy and reinvention. Somehow, the slasher film always returns.

https://www.pastemagazine.com/movies/horror-movies/first-slasher-movie-horror-halloween-psycho/