|Minor Character: Las Vegas|
|Name||Ellie Rebecca Brass|
|Birth Date||September 24, 1982|
|Family||Jim Brass (Stepfather)|
Nancy Brass (Mother; deceased)
Mike O'Toole (Biological father)
|Portrayed By||Nicki Aycox ("Ellie")|
Teal Redmann (Season 5-Onward)
Ellie Brass is Jim Brass's stepdaughter.
Ellie butts heads with Brass frequently due to her profession, and the fact that she is willing to go "bareback" (condomless) if the price is right (Hollywood Brass). Despite this, she did visit Jim at the hospital after his shooting.
Ellie's biological father is former New Jersey Vice cop Mike O'Toole, who was having an affair with Brass' wife (Hollywood Brass). According to Brass, Ellie doesn't know that he's actually not her biological father, but in the 14th season premiere she reveals to Morgan that she knows that. 
Ellie was a prostitute in Los Angeles (where she was known as Jersey). Her best friend went missing and the LA police refused to look into it, so she called Brass and asked him to make a phone call. He went to LA to investigate her missing friend; it turned out she had been murdered.
Ellie came to Las Vegas to work as an "escort".
While Brass was in surgery, Grissom called Ellie to come to the hospital. While her father was in the hospital in critical condition, Ellie seemed more concerned with the pension than her father's likelihood of survival (Way to Go).
Ellie is the main subject in Strip Maul between Jim and a girl called Chastity who knew Ellie and bought her mother's engagement ring for $200. Later, Chastity tells him to go look for Ellie.
Ellie is discovered to be both the girlfriend and partner of the serial killer after shooting him to death. After killing him, she proceeds to shoot Morgan in the back. Later, she kills her mother.
Ellie has been behind the murders in "Skin in the Game" all along and has been held in custody.
At the season finale she tries to commit suicide and is later reconciled with her stepfather, telling him it was not his fault, but there was something wrong in her. Jim, before she wakes up, guesses she already knows he's not her biological father.
Relationship with Jim Brass
Despite Ellie's rebellious behavior, Brass still loves her deeply even though he knows she’s not his daughter and keeps a picture of her as a child on his desk in his office.
When he discovers that Ellie is doing drugs, he keeps after her until she cleans up, but their relationship remains difficult and strained.
- May 15, 2013:
|CSI:Crime Scene Investigation|
- Brass tells Warrick Brown: "Call it the mailman's. Ellie doesn't know despite him and amach being divorced because of it." (Ellie)