Obviously suicide is something that requires serious action if you or someone you know may be suicidal.

If the situation  is imminent immediately call for assistance!

Suicide Prevention, Awareness And Support

https://suicidepreventionlifeline.org/

If you or a loved one is at risk of suicide, please call the National Suicide Prevention Lifeline at 1-800-273-8255 or Text MN to 741741.

If you or a loved one is at imminent risk, please contact 9-1-1 and ask for a Crisis Intervention Team (CIT) officer.

The National Knights of Columbus have an excellent resource available on line.

COPING WITH A SUICIDE CATHOLIC TEACHING AND PASTORAL RESPONSE is part of the The Veritas Series  You can download the entire booklet here.

There is one book available on line that turned my entire line of thinking around. It is Orthodoxy by G. K Chesterton.

Orthodoxy (1908) is a book by G. K. Chesterton that has become a classic of Christian apologetics. Chesterton considered this book a companion to his other work, Heretics, writing it expressly in response to G. S. Street's criticism of the earlier work, "that he was not going to bother about his theology until I had really stated mine". In the book's preface, Chesterton states the purpose is to "attempt an explanation, not of whether the Christian faith can be believed, but of how he personally has come to believe it."

Chesterton addressed suicide specifically in Chapter 5 You can get the excerpt here.

You can read or download the entire book, Orthodoxy here http://www.gutenberg.org/ebooks/16769