Where do I go to find out about a suicide that happened in 1938, September 17 or 18. Although I witnessed this (my mother)-as a child, I saw my father in handcuffs. This happened on 105 Street in Manhattan between Park and Madison
Avenues. Thank you.

I am in the process of writing a book

If you're looking for the death certificate, here's a link to the NYC Dept. of Records:

[www.nyc.gov]