AM Daily, a News Channel, Broadcasts a Report That States

AM Daily, a news channel, broadcasts a report that states that a young man, Elvis, is accused of brutally assaulting his girlfriend, Sherry. Elvis pleads guilty and the prosecutors offer him a deal which he accepts. The incident is declared a homicide a few days later as Sherry dies due to the wounds inflicted during the assault. In this scenario, Elvis cannot be tried for murder due to:

A) the due process clause.
B) the exclusionary rule.
C) the ex post facto law.
D) protection against self-incrimination.
E) prohibition against double jeopardy.