See this legally free ebook:

• Preparation for Death; or, Considerations on the Eternal Maxims, Useful for All as a Book of Meditations, etc., by Saint Alphonsus M. Liguori, translated by an Italian clergyman, approved by the Right Reverend Bishop Fitzpatrick, 8^th edition (Boston: Thomas Sweeney, 1854). With episcopal approbation. Available in multiple formats (epub, pdf, mobi/kindle, etc.) at Internet Archive and Open Library. Also available at HathiTrust Digital Library, and (with some pages accessible to members only) at ForgottenBooks.
• What appears to be a modification with modernized English of this translation is available in pdf format in 4 parts (Part I, Part II, Part III, and Part IV) at Documenta Catholica Omnia; and in pdf format in 4 parts (Part I, Part II, Part III, and Part IV) at Good Catholic Books: Saint Alphonsus de Liguori.

On the commemoration of Saint Liborius of Le Mans in the Extraordinary Form of the Roman Rite, and on the feast of Saint Charbel Mahkluf (Sharbel Maklouf) in the Maronite Rite. Catholic Christians arranging funeral rites may also read A Planner for Catholic Funerals. For more legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).

From sudden and unrepentant death… oh, Lord, deliver us!

[Edited on 22 April 2016 in response to the comment of reader Jane MacIlshenaich. Further edited on 31 December 2017 to add links.]