Son of Texas Plane Crash Victim Calls Attack an Act of Terror

The son of the IRS worker who was the sole person to be killed last week when a tax protester piloted his plane into a Texas office building says his father was an innocent bystander who died at the hands of a terrorist.

And Ken Hunter, whose father, Vernon, was killed in Thursday's plane attack said it was "disgusting" that the pilot's daughter had called her father a hero -- a statement she later retracted.

Joe Stack, 53, set fire to his family home before plowing his single-engine plane into the office building, killing himself and Hunter, a tax service employee and two-tour veteran of the War in Vietnam.

"How is it heroic to take upon acts that Al Qaeda used on September 11 of 2001? What makes that heroic?" Hunter said in an interview Monday on Fox News.

He spoke after Stack's adult daughter, Samantha Bell, told ABC News that her father's beliefs were heroic, and "Now maybe people will listen."

Stack targeted the building, where nearly 200 IRS workers were employed, after posting a ranting manifesto against the agency and the government.

"He did not write the tax law," Hunter said of his father. "No one in that building wrote the tax law."

"Are you telling me that an American citizen committing an attack of terrorism against the United States is heroic?" he continued.

Bell said she offered her deepest condolences to Hunter's family, and she said her father's last actions were "inappropriate."

"But if nobody comes out and speaks up on behalf of injustice, then nothing will ever be accomplished," she said in the interview. "But I do not agree with his last action with what he did. But I do agree about the government."

Bell later retracted her statement that her father was a hero, telling ABC that the only hero who died that day was her father's victim. "I don't want to hurt anybody," she told ABC. "We are mourning for Vernon Hunter."

SLIDESHOW: Pilot's Anti-Government Rage

The Associated Press contributed to this report.