The FBI estimates that there are at any given moment between 25 to 50 serial killers in the United States. That's a chipper thought, and if you're wound as tightly as I am, you'll find this piece from MSN/Mandatory a little unnerving. I've read about most of these [hello, www.serialkillercalandar.com duh ] but the one that really bugs me is the Long Island killer, aka the Craigslist killer.
48 Hours mystery did an excellent piece on that one, give it a peep. How they can not have caught that person is crazy and authorities think the unsub may have moved on due to the intense media attention of the case.