CSI: Crime Scene Investigation: Season 7, Episode 23

7 - 23:

Lady Heather returns when she is found injured after a meeting with a client. She was assaulted, but she didn't react in self defense. When Brass and Catherine come back to the crime scene, they find one of the security guards dead. Meanwhile, Nick and Warrick investigate when the body of a woman is found on a street; further investigation reveals that she was hit in the head by a car.