|Law of Gravity|
|Writer||Anthony E. Zuiker|
|Director||Richard J. Lewis|
|Original Airdate||February 8, 2007|
Law of Gravity is the fifteenth episode of season seven in CSI: Crime Scene Investigation.
When one Trenton cop is murdered in Las Vegas hotel room, a second one threatens to expose secrets from Keppler's past if he doesn't make the case and evidence go away. Meanwhile, Grissom returns from his sabbatical and questions Keppler's methods.
- Final appearance of Michael Keppler.