Season 4, Episode 20
When Ali's testimony results in the release of a killer, the Cold Squad works feverishly to convict the criminal for another case.
Season 4, Episode 19
Cold Squad is convinced they have the necessary to bring down a killer, and Nicco goes so far as to promise the same to the family of one of the victims.
Season 4, Episode 18
A self help lecturer may have influenced a prison guard to muder a prisoner.
Season 4, Episode 17
A cold case turns warm when a mysterious man collapses near a hospital.
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