(CNN) -- A sheriff's deputy who killed six young people at a house party in Crandon, Wisconsin, apparently died after shooting himself three times in the head with a .40-caliber pistol, the state attorney general said.
Initial reports that 20-year-old Tyler Peterson was killed by a police sniper's bullet were apparently incorrect, though it appears the sniper may have shot Peterson in the arm, Attorney General J.B. Van Hollen said.
Although the final forensic determination could take several weeks, the attorney general said that Peterson had his personal .40-caliber Glock when police found him. The three gunshots to the head came from a .40-caliber.
"The three gunshot wounds to the head included two nonfatal rounds with entry points below the chin, and one fatal shot that entered Peterson through the right side of the head," Van Hollen said.
"Each of the three head shots were fired while the gun was in contact with his skin, or extremely close to the skin," he said. "These three head wounds are consistent with self-inflicted wounds, and not consistent with long-range rifle fire."
The fourth gunshot wound, Van Hollen said, struck Peterson in the left bicep and appeared to have been fired from a rifle "at some distance."