The wife of one of the men who was killed by the plane that crashed into the Internal Revenue Services officces in Austin last week has filed a lawsuit against the pilot’s wife, Sheryl Mann Stack. The lawsuit claims that Stack should have warned the IRS employees of possible danger. “Stack was threatened enough by (her husband) that she took her daughter and stayed at a hotel the night before the plane crash,” the lawsuit says. Lawyers for the plaintiff said that the lawsuit was the proper way to determine was assets, including insurance, could be available in the wrongful death suit.