Driscoll Connor (commonly referred to as F8 or the Infinity Killer) is the main antagonist of the Dexter Alternate Reality Game.
This killer started a cycle after a situation dealing with the Roulette Killer back in his younger years, leaving a sideways "eight" at every crime scene...also known as the symbol for "Infinity."
Infinity is an attractive white-male in his 30s with short, somewhat spikey black hair and a square-featured jawline. He typically wears a large pair of black sunglasses but can be seen without them, revealing his eye color to be blue.
He appears to be a rather fit individual, which would support his ability to kill a number of his victims and his height is 6' 2" with tanned skin. His typical attire is white button-up shirts and khaki pants or blue jeans (much like Dexter himself).
Infinity has a rather complex personality. He cares about those that support his actions while he still kills for his own purposes.
Appearances in Other Media
While Infinity himself didn't appear in the Showtime series, a symbol often used by the killer is found on a door during "My Bad", located in the lower right corner as Dexter enters the bathroom where he kills Rankin. It's drawn in blue, that of an Infinity mark.