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.
"[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.