Rebecca Nevins was the Assistant Florida State Attorney. Rebecca was briefly romantically involved with Horatio Caine, but he broke it off when she made a deal with a criminal suspected of killing a cop, committing a series of robberies, and having a relationship with a 16-year-old girl who took part in his crimes.
Nevins was not seen again after their breakup until season 6 (episodes 603 and 607, "Inside Out" and "Chain Reaction") where she appeared as the assigned state prosecutor for Kyle Harmon on two occasions, driving a further wedge between her and Horatio.
In "L.A.", Rebecca tells Horatio she has to suppress evidence submitted by CSI Jesse Cardoza due to his past history with a previous suspect in his former department. To help Horatio clear Cardoza's name, she sends Eric Delko (now the State Attorney's Forensic Expert) out with him to find the missing evidence from that previous case. In episode 823 ("Time Bomb"), she is killed in an explosion that was meant for Eric Delko, who she was meeting. They were both conducting an internal investigation of the lab after diamonds were stolen from an evidence locker.
She was played by Christina Chang.