The third episode of "CSI: Vegas" Season 2 contains a scene in which Joshua blames himself for what happened to Maxime. This prompts Catherine to reveal that she's also felt guilty for crimes that she's had no control over, presumably referring to the death of her friend Grace (Sue Zen Chew). These feelings come with the job, after all.
However, during Catherine's speech, she says that her daughter, Lindsey Willows (Katie Stevens), is currently experiencing feelings of guilt. Catherine doesn't delve into the specifics, but the acknowledgment of Lindsey and her current situation is telling.
For a start, it confirms that Lindsey is still working as a CSI, which was confirmed in the 2015 movie "Immortality," in which she appeared alongside her mother and revealed that she was a Level One. On top of that, the scene paves the way for a Willows family reunion that can be addressed down the line. Whatever is going on with Lindsey needs to be resolved, or else her mother wouldn't have brought it up. Furthermore, Lindsey might prove to be useful to the Vegas team now that she's a CSI in her own right.
