Last organ to putrefy in females is:

Uterus Putrefaction > Caused by bacterias largely originating from intestines and lungs > Stas approximately 3 days after death > Stas simultaneously, however visually observed first at abdomen, usually RIF Due to bacterias in caecum that lies superficially > Then spreads to abdomen wall (gas distension) Ref ; Narayana reddy 33rd ed.