Yahya related to me from Malik from Nafi from Abdullah ibn Umarthat Umar ibn al-Khattab was washed and shrouded and prayed over, yethe was a martyr, may Allah have mercy on him . (ID)
USC-MSA web (English) reference: Book 21, Hadith 36 (ID)
Arabic reference (ID): Book 21, Hadith 997 (ID)