Diane Zamora and David Graham were overachieving high school students in love, sharing common dreams of flying high in the Air Force as a married couple. But a dark secret emerged as they were their first year of college. Diane was a midshipman at the U.S. Naval Academy and David was a cadet at the U.S. Air Force Academy when investigators linked them to the murder of another teen, Adrianne Jones, who had been found dead on a rural Texas road a year earlier. Nancy Grace revisits the infamous Texas cadet murder case with lawyer and psychologist Dr. Brian Russell, host of Investigation Discovery's "Fatal Vows" series, death scene investigator Joseph Scott Morgan, and reporter John Lemley.