Warning: SPOILERS ahead for Dexter: New Blood episode 7.
Dexter: New Blood episode 7 fills in a key missing scene from the original series with the Trinity Killer’s cameo, but it also makes Rita’s death much darker. Dexter's Trinity Killer, aka Arthur Mitchell, was Dexter season 4’s main villain, having evaded authorities for over 30 years. While he resided in Miami with a wife and two children, Trinity let his own Dark Passenger feed its urges while on building trips for his Four Walls charity,
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