The 2010 Austin suicide attack occurred on Thursday, February 18, 2010, when Andrew Joseph Stack III deliberately crashed his single-engine Piper Dakota light aircraft into Building I of the Echelon office complex in Austin, Texas, United States, killing himself and Internal Revenue Service (IRS) manager Vernon Hunter. Thirteen others were injured, two severely. The four-story office building housed an IRS field office occupying the top three floors, along with a couple of private businesses on the first floor. Prior to the crash, Stack had posted a suicide note to his website, expressing his disillusionment with corporations and government agencies such as the IRS. Stack is also suspected of having set fire that morning to his two-story North Austin house, which was mostly destroyed.