A 58-year-old man slipped and fell to his death from the third-floor fire escape of a Harlem apartment building last night, authorities said.

The man, whose name was withheld pending notification of his relatives, was trying to get into his mother’s apartment on 135th Street, near Broadway, while she was on vacation. Cops aren’t sure how he managed to get onto the fire escape, but he used to live in the apartment with his mother.