They don't release hospital records, but they had to report the death to the NY State Dept. of Health Vital Records office. Have you looked at the death index? With the information found there you can request a copy of your relatives death certificate - it may contain more information such as cause of death, etc. I have a great aunt who died in an insane asylum in Utica in 1951 and her death certificate is available.
What year did Catherine Murphy die?