C.S.I. Season 10 Episode 23 (C.S.I. s10e23) with title “Meat Jekyll” airs on Thursday, May 20th 2010 at 09:00 pm via CBS.
Here is summary for C.S.I. Season 10 Episode 23 :

In season 10 finale, with the CSIs attempting to capture the elusive serial killer Dr. Jekyll with the help of another serial murderer, Nate Haskell (Starring by : Bill Irwin). Meanwhile, The hunt proves to be extremely dangerous, with the life of more than one CSI placed in peril.

Few hours after original series aired on TV, online streaming video for C.S.I. Season 10 Episode 23 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.