Most victims of foul play are easily identified because they’re found in familiar places and reported by folks who knew them. But those found in remote or odd places with no ID create problems for investigators. In these cases, identifying the corpse is a critical step in solving the case.
Crime Museum: Postmortem Identification: https://www.crimemuseum.org/crime-library/forensic-investigation/postmortem-identification/
The Conversation: How Do We Identify Human Remains?: http://theconversation.com/how-do-we-identify-human-remains-121315
Crime and Science Radio Interview with Todd Matthews of NamUs: https://www.blogtalkradio.com/suspensemagazine/2016/12/03/crime-and-science-radio-with-special-todd-matthews
A complete discussion of these issues can be found in my books FORENSICS FOR DUMMIES and HOWDUNNIT:FORENSICS. Check them out at: https://www.dplylemd.com/books