I was looking for forensic linguistics links, and there's a whole load of them; but often they're rather academic - or the meat is hidden away, because they want you to take a paid course.
This BBC article gives a neat case study - using some concepts you'll recognise. Try Wikipedia's Forensic Linguistics page as a follow-up - if you haven't already. There are lots of links to cases and YouTube videos of lectures there. http://news.bbc.co.uk/1/hi/sci/tech/7600769.stm
