February 6, 2013 -- Updated 1226 GMT (2026 HKT) Federal Bureau of Prisons officer Nancy Gonzalez, 29, is seen in a courtrooom sketch. New York (CNN) -- A pregnant prison guard was accused Tuesday of having sex with an incarcerated cop killer, according to a source close to the investigation. He was the first person in the city to receive the death sentence from a federal jury since 1954.