what's possible when you have high-speed internet at home? the library never closes. it makes it so much better to do homework when you're at home. internet essentials from comcast. helping to bridge the digital divide. ♪ ♪ in the spring of 1994, joel rifkin goes on trial for the murder of tiffany bresciani, his final victim. he pleads not guilty by reason of insanity. >> we had to really litigate the deaths of all 17 young women to show the jury that this was not the workings of somebody who didn't know what they were doing and didn't realize it was wrong, but instead, the workings of a mind that was very calculating,