The king has recently learned that his son has been killed by a mystery person. Wanting to know who committed the murder, he started to ask the people that have been around his son recently. He asked his son's caretaker, the gardeners, his own wife, the mailman, everyone in the entire palace! But everyone has said no to killing his son and no one saw the killer or the weapon.
So the king went to the wisest of the wisest men on Earth and asked him who killed his son. The man would only give a hint to him:
The day your son died is Sunday, which is today.
The king puzzled, walked to his palace to speak to his advisors. A year later, the king had solved the mystery and swiftly executed the murderer and brought justice to his son. So the question is, who was the murderer?