2008_08_policeline.jpgA 21-year-old man has been arrested for fatally slashing his 32-year-old girlfriend in a Queens apartment. Veronica Rivera was pronounced dead at the scene, and police say she was killed in front of her 9-year-old and 6-month-old daughter after an argument with the baby's father, Pedro Ayala. Rivera's mother said her daughter had left Ayala twice and told the Post, "She was scared for his life. They moved into the basement together awhile ago, but she left him. He kept begging her to come back... and he begged her tonight to bring the baby." The children were unharmed,