Tonight on TV

Big Brother 6 (7 p.m., Ch. 2): Still locked in that house.

CSI (8 p.m., Ch. 2): A flight attendant is raped. (Repeat)

The O.C. (8 p.m., Ch. 13): Sandy and the boys go to Miami to hang with the Cohens' matriarch. (Repeat)

Primetime (9 p.m., Ch. 4): Mary Katherine Smart, Elizabeth's younger sister, is interviewed.

Globe Trekker (9 p.m., Ch. 7): Justine Shapiro explores Washington, D.C., including a meeting with Utah Sen. Orrin Hatch.