Jessica Lucas will guest star on four episodes of CSI: Crime Scene Investigation, beginning Thursday, Oct. 11 (9:00-10:00 PM, ET/PT) on CBS.

Lucas plays Veronica Lake, aka "Ronnie," a young, vivacious, curious and smart new CSI in training who chose to go to Vegas because of the increase in crime rates there.

A.J. Buckley joins the cast of CSI: NY as a series regular, after recurring for two seasons as gifted lab technician "Adam Ross," who specializes in the analysis of trace evidence.