Leah Linwood is the sister of suspected rape victim and confirmed murderer Laurel Linwood. It was revealed Leah was molested by the sisters' father when she was a child, which Laurel was a witness to, and the two sisters never got Leah justice.
Laurel later was taken into the SVU precinct to be questioned about her allegations of being raped. It's revealed she murdered a man named Greg Harvey in a psychotic fit, and the lies of rape were meant to be targeted at Leah out of jealousy. (SVU: "Something Happened")