This chapter discusses various signs of death. The changes which occur after death are helpful in estimation of the approximate time of death and to differentiate death from suspended animation. It can be classified into, immediate changes, early changes, and late changes. Cooling of the dead body, postmortem staining, rigor mortis, cadaveric spasm, heat stiffening, cold stiffening, decomposition/putrefaction, decomposition of submerged body, and entomology, are some topics discussed in detail. Adipocere is formation of an offensive, sweet rancid smelling, soft, whitish or grayish white, crumbly, waxy and greasy material occurring in fatty tissues of a dead body. It is the surest sign of death, gives a rough estimate about the time since death, and when the process involves the face, the features are well preserved, which help in identification. Mummification is important to know when crime was committed and it gives the police a starting point for their inquiries, and allows them to deal with the information available more efficiently.