Catechism of the Catholic Church §1011 — excerpt
In death, God calls man to himself. Therefore the Christian can experience a desire for death like St. Paul's: "My desire is to depart and be with Christ.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: St. Ignatius of Antioch, Ad Rom., 6, 1- 2: Apostolic Fathers, II/2, 223-224 · St. Teresa of Avila, Life, chap. 1 · St. Therese of Lisieux, the Last Conversations