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The Dexter Alternate Reality Game (commonly referred to as ARG) is a community based investigation where multiple people work to catch the mysterious Infinity Killer. The case involves the Serial Huntress, a woman tracking Infinity and ultimately leads to a final confrontation that leaves Infinity dead. The Serial Huntress released multiple videos updating on information up until this encounter and left with one last briefing.
Just before the start of Season 5, it was decided by players which character should die...the Infinity Killer or the Serial Huntress. Players around the world chose to let the killer die, sparing Dee's life.