141:21 If a person’s close relative died on the fast of Esther, he would be an onen on Purim night before the burial. He should hear the Megillah read by another, and he should not eat meat or drink wine because one is not obligated in the Purim meal at night. On Purim day, after everyone has left shul, the deceased is buried. After that, the bereaved davens and reads the Megillah, or listens to someone else reading it for him. If he heard the Megillah read before the burial, he has fulfilled his obligation. In such a case, it would be appropriate for him to read it again, without the brachos. He should not put on tefillin even after the burial because it is the first day of his mourning. An onen on Purim day is permitted to eat meat and to drink wine.
141:22 On Purim morning, one goes to shul early. After the Shemoneh Esrei, half-kaddish is recited. Three men are called to the Torah to read from the section “Amalek came” (Exodus 17:8-16). (Hallel is not recited on Purim because, even though we were saved from destruction, we remained subjects of Ahasuerus – Mishnah Brurah 693:7.) Half-kaddish is recited, the Torah is returned to the aron, and we read the Megillah. After the concluding bracha, we do not recite Asher Heini (that G-d destroyed the counsel of nations) as we do at night. After concluding the bracha Ha(k)Eil HaMoshia, we recite Shoshanas Yaakov. We continue with Ashrei, U’va l’Tziyon, and full Kaddish including Tiskabeil. (Tachanun and Lamnatzeiach are not recited both days of Purim – Mishnah Brurah 693:8.) Tefillin are not removed until after hearing the Megilah because the Talmud (Megillah 16b) tells us that “glory” in Esther 8:16 refers to Tefillin. If there is a baby to be circumcised, the circumcision is performed before reading the Megillah because “rejoicing” in that same verse refers to circumcision and is mentioned first.