Nope, Benson's brother wasn't the rapist. The other female cop - can't remember her name now - set him up as she thought he raped her younger sister, who had just died of a drug overdose. She thought that her sister became a drug addict as a result of Benson's brother raping her, when in fact it was her father who had molested her sister. Very different, emotional episode - not normally my cup of tea, but Mariska Hagiarty did a superb job carrying the storyline.
Now, did anyone see the last 10 minutes of CI last night? I fell asleep.