We don't know the full context, but the popular Halo series was mentioned at the trial of a man charged with killing four people and badly injuring several others during during a 2005 escape and rampage in Atlanta.
The Atlanta Journal-Constitution's coverage of the Brian Nichols trial notes that Army Sgt. Charlie Maurice Sellers, a longtime friend of Nichols, testified:
"[Nichols and his friends] liked to play that Halo video game,” said Nichols’ friend Army Sgt. Charlie Maurice Sellers. Halo is a science-fiction video game that is premised on rebellion and civil war. “The object is … to see who can get the most kills,” Sellers said.
The case generated national publicity. Ashley Smith, a woman kidnapped by Nichols, was eventually credited with helping police capture him.
Nichols is 36.
Accusing your opponent of being a flip-flopper? Why, that's practically Politics 101.
But calling out a challenger for playing Halo and blogging? Must be a sign of the times.
In Maricopa County, Arizona, Republican incumbent Fulton Brock has rolled out those allegations and more by way of slinging mud at his Democratic challenger, Ed Hermes (left). Both men are vying for the job of county supervisor.
As Joystiq reports, a campaign mailing sent out by Fulton uses the Halo referenced in an attempt to portray Hermes as young and inexperienced:
Skilled player of popular video game Halo. Hermes was quoted in the ASU student newspaper as saying, "I am addicted to Halo and play almost every night."
The anti-Hermes ad also accuses the Democrat of being a student mascot at football games as well as a blogger and a video gamer.
Police in Watertown, Wisconsin believe that an attempt to imitate Halo may have played a role in the death of an 11-year-old boy from an accidental gunshot.
As reported by the Watertown Daily Times, Joshua Nimm apparently took the day off from school to do some gaming:
[Police] said it appeared... that after playing a combat video game called “Halo,” Nimm took the gun and tried to recreate some of the things that had occurred in the game. With an automatic rifle, [Sgt.] Lee said there can sometimes be confusion over whether it contains a magazine or not, and this confusion likely led to Nimm's death.
“He took the magazine out and forgot to eject a round that was in the chamber. He probably thought the gun was unloaded,” Lee said.

Halo Graphic Novel
-reviewed for GamePolitics by Matt Paprocki
Transcending the world of video games, Halo is a cultural phenomenon.
While the days of seeing video game characters plastered on boxes of kiddie cereal are becoming less common, their more grown-up progress into other mediums is becoming commonplace, like movies and books. Thankfully, the Halo Graphic Novel exists in a realm free from director Uwe Boll’s influence.Entrusted to the hands of comic masters Marvel, this beloved Xbox franchise is in the best of hands.
While a slender volulme, the Halo Graphic Novel is jammed with four separate stories. Multiple authors and artists contribute their work to craft this gorgeous book, including the likes Simon Bisley, Brett Lewis, and Moebius. According to his bio, Lewis doesn’t even own a TV, but was so gripped by the paperbook novelizations of the Halo universe that he ended up contributing some of the graphic novel’s most vivid writing.