Timothy Beard, 23, and his brother Christian Beard, 21, live in separate apartments at 10 Prospect St. in Goffstown. Police said the brothers were drinking and playing the first-person shooter video game "Halo" on Sunday night. At some point, Timothy Beard took out a 9mm handgun he had purchased a few weeks before. His girlfriend said it was for self-protection in case of a break-in. Timothy Beard told police that he was messing around with the gun when he accidentally shot his brother, investigators said. Police said they are still trying to figure out what led up to the gunshot. "From what we understand, from a preliminary investigation from the four like-aged adults that were there, there were some video games that were being played," Chief Robert Browne said. "And as such, one of them, Timothy Beard, had picked up the firearm and at one point pointed it towards his brother, and a round went off." Witnesses said there was no fighting or aggression leading up to the gunshot, and that everyone seemed to be having a good time. One witness described the brothers as "best friends." Timothy Beard’s girlfriend said that right before the gunshot, he said, "When a zombie comes, hit him like this, in the head." Another witness said Christian Beard then said something to the effect of, "Shoot me. I dare you." Timothy Beard told police that's when he pulled the trigger, investigators said. Police said he had the gun just inches from his brother’s temple. Christian Beard was shot in the forehead and was taken to Catholic Medical Center before he was flown to a Boston hospital. He was listed in critical condition.