The trial began Wednesday for a woman accused of slicing off her estranged boyfriend's penis. Delmy Margoth Ruiz said she attacked her ex-boyfriend because he had been unfaithful and had physically abused her. Rene Aramando Nunez, 34, took the stand to explain to jurors how his longtime girlfriend, Ruiz, 49, mutilated him. Ruiz, a Salvadoran immigrant, was charged with aggravated assault with a deadly weapon after police said she cut off 80 percent of Nunez's penis with a kitchen knife on Oct. 29, 2004, as he slept at a northeast Houston home he co-owned with Ruiz. If convicted, Ruiz could...