The widow of the Internal Revenue Service employee killed when a Texas man crashed his plane into the agency’s Austin office is suing the pilot’s widow.

Attorney Daniel Ross says the lawsuit against Sheryl Stack seeks to determine if the pilot left behind insurance policies or other assets.

Ross represents Valerie Hunter, whose 68-year-old husband Vernon Hunter was killed last week when authorities say Joseph Stack deliberately crashed his single-engine plane into the IRS office.

Joseph Stack left behind a lengthy anti-government Internet posting blaming the IRS for personal problems spanning decades.

The lawsuit filed on Monday says Sheryl Stack should have warned others about her husband.

A message seeking comment was left on Tuesday with a family spokesman for Sheryl Stack.

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