After fifteen seasons, tonight marks the final ever episode of CSI, it truly is the end of an era. There's a double bill of the show tonight on RTE2, with the investigators looking into the death of a young man along with two missing teenage girls he knew. The story continues into the second and final episode where the team start to worry that the Gig Harbor Killer might have returned. We will be sad to see this show go but never fear though, Ted Danson is set to move over to 'CSI: Cyber' so all is not lost.