This is the real person behind the upcoming movie, Domino, starring Keira Knightley about a female bounty hunter in Los Angeles.

"IF you are born into the British high life, specifically to the actor Laurence Harvey and Pauline Stone, a Vogue model, and wend your way through life so that you end up chasing drug dealers, murderers and thieves through the streets of South Central Los Angeles as a bounty hunter, chances are good that someone will eventually hear your story and think it's a movie. " (NYTimes)

She died early this year before the movie chronicling her exploits coming out next week.

And here's a wikipedia entry on bountyhunter (yes it is legal)

"A bounty hunter is an individual who seeks out fugitives for a monetary reward. It is legal in the United States thanks to the 1872 U.S. Supreme Court case (Taylor v. Taintor) which established that the person into whose custody a person accused of a crime is remanded as part of the accused's bail has sweeping rights to recover that person. Thus most bounty hunters are in the employ of a bail bondsman."