Search for terms like “FBI case file PDF” or “unsolved homicide report.” Many FOIA (Freedom of Information Act) requests end up here. Look for collections labeled “FBI Vault” or “State Police Cold Case Files.”

The brutal murder of Elizabeth Short in Los Angeles. The Zodiac Killer (1968–1969):

Skip the random Reddit threads. Start here:

The body was hers.

If you are looking for a "case file" to solve at home, many popular mystery games offer digital download versions. These PDFs allow you to play "detective" using fictional evidence that looks like the real thing.

for one of these cases if you'd like to read the actual, unfiltered reports.

Search for the "Lieutenant Frank Jemison Collection" PDF. It is only 147 pages, but it contains the most actionable leads.