Did the head of state participate in the action that caused his/her death (like a duel), was it entirely the act of the assassin, did the assassin have outside assistance?
Was the assassin banished to a particular place, or were they otherwise free to travel? Was the assassin banished from the HoS’s country, or from somewhere else?
Was the head of state a religious leader as well?
Was the leader:
How did the people of HIS OWN country think of him? Was he:
How did the people of OTHER countries think of him? Was he:
How did people in various countries react to his death?
Does history regard him as
Whoever it was who chose banishment for the assassin:
Could they have instead chosen execution?
Could they instead have chosen imprisonment?
Could they instead have chosen a property penalty (fine, confiscation, etc.)?
Could they instead have chosen nonlethal maiming of some sort as a punishment?
Was the HoS originally a citizen of the nation he was HoS of?
Was the assassin a citizen of the nation he was HoS of?
Was the authority that ordered the banishment an authority of that nation?
Did the assassin have a Siamese twin who was innocent, and the assassin’s death would have killed the innocent twin too?
Was the assassin a diplomat?
Was the assassin mentally competent? Did he / she intend for the HoS to die?
Is the gender of the assassin relevant?
Was the assassin human?
I’m very sorry to leave you all hanging. I’ve had a lot going on and I haven’t been able to play. Here’s a link to the answer of the last puzzle I gave. If anyone wants to continue with a new one, I’m game.
Mary (not her real name) was born in 1895. She worked as a kitchen maid, married, and died in 1944 of a brain hemorrhage. Mary was pretty much forgotten until the 1980’s when people suddenly began visiting her grave. Now hundreds (maybe more) of people come to her burial site every year and it is even part of a guided tour. Many visitors will tell you Mary once possessed an unusual item: a body part in a container! 
This is not true. What is Mary’s real name?
Is Mary’s existence medically important?
reply to Zyada:
Is Mary’s existence medically important?
No.
Was Mary a human female?
Was something in the news in the 1980’s that made people start visiting her grave?
Was there something unusual about her grave?
Is the specific body part she was supposed to have in a jar important?
Was it a:
brain
head
hand
penis/vagina
Is Mary herself the container?
Was Mary associated with a famous person?
Was she portrayed in, or the subject of, a movie in the 1980’s?
reply to Mahaloth:
Was Mary a human female? Yes
Was something in the news in the 1980’s that made people start visiting her grave? Yes
Was there something unusual about her grave? No
Is the specific body part she was supposed to have in a jar important? Yes
Was it a: *
brain No
head No
hand No
penis/vagina No
reply to blabbermeister:
Is Mary herself the container? No.
reply to Cheesesteak:
Was Mary associated with a famous person? Yes
Was she portrayed in, or the subject of, a movie in the 1980’s? No
Did that body part come from the famous person she was associated with? From Mary? Is the body part’s owner significant?
Was the time and/or manner of her death relevant?
People have been calling the container a jar, but was it?
Was her rise in fame the result of being included in a fiction book?
Was her rise in fame the result of being included in any fictional work?
Is Mary widely known for anything other than the alleged body part in a container?