Eric Thompson, the online weapons dealer who sold the handgun used in the Virginia Tech massacre and provided equipment in two other mass shootings, last month abruptly closed his Green Bay, Wis.-based business, TGSCOM Inc. (Associated Press)

Eric Thompson, the online weapons dealer who sold the handgun used in the Virginia Tech massacre and provided equipment in two other mass shootings, last month abruptly closed his Green Bay, Wis.-based business, TGSCOM Inc. (Associated Press)