It depends on what country you are in. I would say if someone kills a king they are guilty of killing a king. Be more specific in the future. Give us a context and you will get a better answer. Always be specific, even if it seems unnecessary.
a murderer?
That person is guilty of murder
Guilty - Gravity Kills song - was created on 1996-02-13.
The term for a person who kills a king is a "regicide."
few minutes
Yes, a jury decides if a person is guilty or not guilty.
the person found guilty
Said person would be an "accessory before the fact" and would be guilty of what ever the perpetrator is guilty of
No. King Charles I thought it was impossible to have committed treason since he was the king. Whether he was in-fact guilty of treason is debatable.
For a person to be guilty, someone has to prove with supportive reasons that the person did something wrong.
Claudius feels guilty because he killed King Hamlet
No. Of course not. Double Jeopardy is only applicable to the SAME crime. If he/she kills a person at another time it is another murder.