CSI: Crime Scene Investigation (2000)

S4E2 All for Our Country (2)

After the primary suspects in Grissom's serial killer investigation are killed, Grissom begins to suspect that someone within the department might be involved. Tension rises between Grissom and Brass as Grissom proposes that a police officer could be responsible. Meanwhile, Catherine and Sara look into the mysterious death of a college football enthusiast when his swollen body is discovered in a bathtub.