That was Diane Zamora who was arrested while attending Annapolis and her fiance, David Graham, who had just entered the USAFA. Weird murder, sort of like a reverse Romeo and Juliet. Zamora's roommates whom she had told of the murder, turned her in to the Academy Chaplain due to the honor system (and the fact that they were scared of her). click
Excerpt from link: "The case of David Graham and Diane Zamora inspired NBC's TV movie, "Love's Deadly Triangle: The Texas Cadet Murder," which KXAS-TV (NBC's affiliate in Dallas-Fort Worth) refused to broadcast when it aired in February 1997."
Well, at best, I was half right ... good info on your part. Thanks.