All are useful in knowing the time since death Except
Sequential changes after death like the degree of rigor mois, postmoem hypostasis, postmoem cooling and extent of putrefactive changes are assessed. They will help a great deal in asceaining the time since death. Ref - Krishan Vij 5th edition
Cooling of the body
Rigor mois
Postmoem staining
Postmoem bruising
Identification