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Well I've seen this movie couple of years back..It may be a bit old may be 80's or 90's ;am not sure
I do remember most of the movie scenes though.. Its about this serial killer who kills women since his childhood.. In the opening scene the killer is with a hooker & later at the subway she calls her friend to tell how freaky today the customer was & may be he is following her.. She asks to catch up with her in the next station.. In the train the killer stabs the hooker and at the next station he even kills her friend
In another scene the lady scratches his face when he attacks her & so he chops of her fingers and then dumps her....
IMPORTANT thing is the killer is none other than hero's friend & he has asthma .. Hero particularly remembers the hissing sound of the asthma inhaler since his childhood when he was locked and his mother was stabbed in her throat with a trumpet or so.. He cud not realize this fact till the end...
In his childhood the killings happen over a specific region because then he is just a kid.. his father knew about this & so sent him to boarding school & when he came back as an adult the killings are random all over the city