S1·E4 Echoes in the Dark

When the verdict of a man convicted seven years ago of murdering his wife is reversed, Ben risks losing his badge to gather evidence to convict him of murdering his son (whose body was never found) as well. In another case, Nora and Walt struggle with a witness who agrees to testify against the man who murdered her boyfriend but reverses her decision when the murderer escapes from jail and threatens her.