Bathe him with water mixed with lote (leaves) and shroud him in two (pieces of) cloth and do'not cover his head for he would come on the Day of Resurrection pronouncing Talbiya. (Using translation from Muslim 1206d)
أَقْبَلَ رَجُلٌ حَرَامًا مَعَ النَّبِيِّ ﷺ فَخَرَّ مِنْ بَعِيرِهِ فَوُقِصَ وَقْصًا فَمَاتَ فَقَالَ النَّبِيُّ ﷺ اغْسِلُوهُ بِمَاءٍ وَسِدْرٍ وَأَلْبِسُوهُ ثَوْبَيْهِ وَلَا تُخَمِّرُوا رَأْسَهُ؛ فَإِنَّهُ يَأْتِي يَوْمَ الْقِيَامَةِ يُلَبِّي