Eva Whitfield was the secondary villainess from "I, Witness," episode 7.13 of Castle.
She was played by Brianna Brown
Eva Whitfield was the second wife of Cole Whitfield, and the old college acquaintance of Richard Castle. Eva was shown early in the episode approaching Castle regarding her failing marriage.
As revealed later on, Eva colluded with lawyer Aubrey Haskins and Cole's business partner, Robert James, in an evil plot to set up Cole. After finding out that Cole was sleeping with James' wife, the evil Eva participated in a plan to fake her own murder and implicate Cole in the crime. The scheming villainess was "killed" by Robert (who posed as Cole) in the Whitfield household, and it was witnessed by Castle, which led to Cole being the prime suspect. Once Cole is convicted, Eva would receive his fortune.
After the set-up, however, Eva began to have cold feet and had planned to come clean regarding the ruse. This led to a confrontation with Aubrey and Eva at the latter's studio apartment, which ended with Eva bludgeoned to death by the evil Aubrey.