UPDATE: Manifesto (suicide note) was removed from website by FBI

This website has been taken offline due to the sensitive nature of the events that transpired in Texas this morning and in compliance with a request from the FBI. If you want to see the original letter, please see the archived version at thesmokinggun.com: http://www.thesmokinggun.com/archive/years/2010/0218102stack1.html

Regards,
T35 Hosting

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Intentional but likely not terrorism, which is fed-speak for “disgruntled nut lacking a political motive.”
Did he really lack a political motive, though? Hmmm.

An NTSB official told Fox News that they are investigating this as an intentional act, and said it appears the pilot set his own house on fire and then got in his plane and flew it into the building. An NTSB spokesman, however, told FoxNews.com that “we can’t confirm any of that.”
An Internal Revenue Service office is located inside the building.

Maybe the guy was blown off course. Or … maybe not:

Update: Business Insider claims that this is Stack’s website — and there’s a suicide note posted. Sounds like he had issues with the tax code dating back decades. Quote:
After my experience with the CPA world, following the business crash I swore that I’d never enter another accountant’s office again. But here I am with a new marriage and a boatload of undocumented income, not to mention an expensive new business asset, a piano, which I had no idea how to handle. After considerable thought I decided that it would be irresponsible NOT to get professional help; a very big mistake. (continues here)