The former IRS law enforcement officer testified that he did not stab his wife, Christine Banfield, but instead shot another man he believed was attacking her, insisting prosecutors have built the case on the wrong theory. As reported by AP News, he told the court he saw Joseph Ryan standing over Christine Banfield while holding a knife. 'I don't know that I've ever been more panicked in my life,' Banfield testified. Prosecutors have highlighted her romantic relationship with Banfield, which began months before Christine Banfield's death and continued afterwards. Jurors were also shown video of Banfield being informed of his wife's death, in which he appears visibly distraught.