A former roommate of a Naval Academy female cadet convicted in the slaying of a 16-year-old romantic rival testified Friday that the cadet said her fiance shot and killed the girl.

"She told me that she and her boyfriend, David, had killed a girl while they were in high school," Jennifer McKearny said of Diane Zamora. "She said the girl had slept with David and she said in order to make up for it, he had to kill her."The prosecution contends that David Graham, 20, a former Air Force Academy cadet, killed Adrianne Jones in December 1995 at the urging of Zamora, his jealous fiancee.