Teenagers Diane Zamora and David Graham started dating in August 1995, but in November of that year Graham was unfaithful to Diane. When he confessed his infidelity, Diane told him he must kill the girl he had betrayed her with, Adrianne Jones. On 3 December, in their home town of Grand Prairie, Texas, David arranged a date with Adrianne. Together they drove out to a secluded spot where Diane, hidden in the car, smashed her victim’s head in with a dumbbell. The body was found the next day and David was interviewed and cleared, but in August the following year Diane confessed to two friends who promptly contacted the authorities. On 17 February 1998 Diane was convicted and received a life sentence. In July of that year David was also convicted and sentenced to life. Neither will be eligible for parole for 40 years.