Answer:
Duncan's sons Malcolm and Donalbain became the main suspects of the King's murder.
Step-by-step explanation:
William Shakespeare's tragic play "Macbeth" tells the story of how an over ambitious Macbeth, along with the persuasion of his wife, brought about his own downfall.
After the prophecy of the three witches came true and he had been made Thane of Glamis and Cawdor, Macbeth began to become more ambitious about his own life. He decided to take over the kingship by himself, killing Duncan and putting the blame on the chamberlains. With the death of their father, the two princes Malcolm and Donalbain fled to England, thereby adding the suspicion on them. Thus, they became the main suspects for the king's murder.