Until now, that is.
Case No.
She drops the knife and opens the door to her freedom.

Credit: ABC/Sven Frenzel
Oh, did I give away the ending already?
During the interview, Hayes notices scars on Sierras arm.
(Hmm, maybe Tess was right.

Perhaps Sam should have recused himself from the case, since its obvious hes unable to remain impartial.)
Since Fleck drove a pickup, there was no trunk in which he could have stuffed Sierra.
As Frankie bluntly tells Sam, I think you locked up the wrong dude.
Hello, suspect no.
For his part, the chimes outside Melissas dining-room window is what tips him off to her guilt.
Cut to Fleck in prison, where Sam is there to deliver the good news about his release.
The truth hurts, doesnt it, Mr. Spencer?
Episode 8 Case Notes:
Maxine:Well, I think being held hostage by a psychopath will suffice.