He ain't crowned yet. Maybe we'll get intruigue, patricide. Skip a generation.
Edit: Sorry. Too soon. Too cold.
It wouldn't matter because he would still have been king. The heir apparent accedes immediately, and automatically, upon the death of the Monarch. The late Queen acceded to the throne on February 6, 1952, when George VI died, but her coronation wasn't until June 1953. A better example might be King Edward VIII, who was king from January 20 to December 11, 1936, but never had a coronation because he abdicated before it was held (they continued with the same coronation and simply crowned George VI instead).
Now, hypothetically, there could be a bizarre scenario in which the heir apparent converted to Catholicism or Orthodoxy
right as the previous Monarch died, thereby removing himself from the line of succession. But that would take some very remarkable timing.