21. Erev Shabbos:

The laws of Aninus continue to apply on Erev Shabbos, until the start of Shabbos, as explained next.

Passed away close to Shabbos:[1] In the event that the deceased passed away several hours before Shabbos, and the Chevra Kadisha does not perform burials at that time, nevertheless, the laws of Aninus apply.[2]

Bathing: It is forbidden for the Onen to bathe on Erev Shabbos in honor of Shabbos, just as is the law during Shiva. See Chapter 20 Halacha 3 regarding going to Mikveh and further details.

Shnayim Mikra:[3] The Onen may not recite Shnayim Mikra on Erev Shabbos, although he may do so on Shabbos. See Chapter 20 Halacha 10 regarding Shiva and the same applies regarding Aninus.

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[1] Pischeiy Teshuvah 341:22, based on Noda Beyehuda Tinyana Y.D. 211; This would certainly apply according to Admur 71:1 in his first opinion and practical custom

Other opinions: Some Poskim rule that in such a case the laws of Aninus do not begin until Motzei Shabbos, and he is thus obligated to Daven Mincha. [Yad Eliyahu 16, brought in Pischeiy Teshuvah ibid; Rav SZ”A brought in Pnei Baruch Onen 20; Poskim in Nitei Gavriel 25:1]

[2] The reason: As although the Onen is unable to bury him then, he may be involved in other preparations, such as the Tachrichin. [ibid]

[3] Birkeiy Yosef 341:14; Aruch Hashulchan 341:16; Nitei Gavriel 27:3