[center][b]Tony Stark[/b], trace technician
[img]http://media-cache-ec0.pinimg.com/736x/de/4d/2e/de4d2e4d05c40e0473bfd07ee3ef73c1.jpg[/img][/center]Tony was born in Manhatten, New York and as a lab technician, he was transferred to the Las Vegas crime lab from the Los Angeles crime lab, when his superiors felt that he had an attitude problem. Stark had tried to pick up a prostitute who turned out to be an undercover police officer. Because he was underage, the arrest didn't go on his permanent record. Tony has annoyed his co-workers and superiors, and he is one of the employees initially suspected of causing an explosion in the lab where co-worker Loki Laufeyson was working and, as a result, injured. Despite being accused of causing the explosion, he vehemently denies responsibility to the point of promising to call his lawyer if taken to case on the incident. He is ultimately cleared when it's discovered that someone else caused the explosion. Yet Stark seems to be under the impression that he's held in much higher regard by the senior CSIs than he truly is and doesn't note his own character flaws. Despite his attitude, Stark sometimes redeems himself. 

Stark is also known for having an unusually acute sense of smell, and is able to identify many chemical compounds by their odor alone. In one case, he was asked to verify if a person's stomach contents had traces of cyanide, which has a smell not unlike bitter almonds, but which requires a specific scent-related gene to be able to discern, which Stark possesses. He is known for his disdain of working on the field. Despite this, he almost lazily discovered crucial evidence in a matter of seconds during one outing.

Tony has had an interest in Ksenia, but she has never given him any reason to believe she shares his feelings. However, Loki Laufeyson arranges "man dates" in which he meets up with Tony every week to take his mind off Ksenia. Felton and Stark are usually seen as rivals, leading to something of a "love-hate relationship". The two would often argue, but they do play board games together, and the two, along with Thor, "kidnapped" Loki to take him out for his birthday.

Although Sally Brooks has previously pretended to date Stark in order to get his mother off his back, Stark states in that they could not date for real. While insisting she has no interest in any case, Sally queries this, but all Stark will say is that his recent trip to Italy with his mother was "life-changing". However, when a fellow CSI is shot and put in the hospital to recover, Stark is there for Sally as support. Sally begins to break down, blaming herself for the agent's current state. When Stark attempts to calm her down, she suddenly kisses him. He's shocked, and both agree to pretend that it didn't happen. Sally says that he is her best friend. 

Stark met a gorgeous woman from Italy while on vacation and the two become engaged, but wind up breaking off their engagement after his fiance insists that once they marry, they'll move back to Italy to work on a relative's vineyard. Stark tells his fiance that he's a scientist and can never do that. The two part ways amicably.