80s slasher stain glass

[damseldestress]

Hi, I'm trying to remember the title of an 80s horror movie. I thought it was maniac or even pieces but its neither. All I remember is  a bathroom scene wear the killer scalps a woman, and later wears her hair. and I think the "hero" of the film was a reporter. Took place in new york i believe. Also the ending took place in a library, the killer is pushed through stain glass window of sky light. Hope someone can help

[claws]

Could be I, Madman (1989)

[damseldestress]

no, it wasn't madman, it def had an urban setting. although i love madman

[damseldestress]

OHHH, sorry I missed i misread your post you said I, madman not madman lol. you were right. THANKS