Ok so i took biomedical sciences. Totally going to help.
Um some of the processes include examining the a dead person if they have died recently.
Others include looking at bone structure as well as certain factors that determine what types of diseases they have and time of death and such and such.
Again i'm not really sure soooooooo this is all i can really get you.
P.S. i think with some modern technology people are able to extract dna from bones but don't quote me on this. That DNA can be used to identify people. I think.