Who Is Suspected of Killing King Duncan

Who Is Suspected of Killing King Duncan

In William Shakespeare’s Macbeth, King Duncan is suspected to have been killed by Macbeth, Thane of Glamis and later King of Scotland. The play presents Macbeth as the central suspect through his direct involvement, his possession of the murder weapon, and his rapid elevation to kingship immediately afterward. Lady Macbeth is deeply complicit as planner and instigator, though the regicide is carried out by Macbeth under her influence. Other characters, including the Porter, are suspected by observers, while Banquo’s ghost reflects suspicion turned inward, and Macduff later investigates and opposes Macbeth’s rule.

Key Suspects in Duncan’s Murder

Macbeth

Macbeth is the primary suspect due to his proximity to Duncan, his execution of the murder, and his quick accession to the throne. He initially resists the idea of killing Duncan but, spurred by prophecy and his wife’s goading, commits the act. Afterward, he frames Duncan’s sons by placing bloodied daggers on them, ensuring they become suspects and flee. Macbeth’s guilt manifests in hallucinations, most famously of a bloody dagger leading him to Duncan’s chamber, underscoring his direct responsibility.

Lady Macbeth

Lady Macbeth is a central architect of the regicide rather than the physical killer. She crafts the plan, questions her husband’s resolve, and vows to be more cruel if needed. After the murder, she smears blood on the guards to implicate them and later sleepwalks, revealing her torment. While she does not wield the dagger herself, her ambition and manipulation make her equally culpable in the plot.

Duncan’s Sons

Duncan’s sons, Malcolm and Donalbain, become suspects after they flee the country following their father’s murder. Their flight is interpreted as an admission of guilt, though it is actually a prudent response to danger. Their departure allows Macbeth to claim the throne, redirecting suspicion away from himself and onto the princes.

Evidence and Motive in Macbeth

The Porter’s Role and Public Suspicion

The Porter’s comic scene temporarily shifts suspicion to the household staff, as he references an equivocator who lies equivocally, echoing the Jesuitical equivocation associated with the Gunpowder Plot. This moment entertainingly distracts from the deeper question of regicide while reinforcing themes of deceit. In the broader play, the Porter humanizes the moral chaos following Duncan’s death, reminding the audience that confusion and blame extend beyond the central characters.

Banquo’s Ghost and Internal Suspicion

Banquo’s ghost at the banquet represents Macbeth’s awareness of suspicion and his fractured conscience. Macbeth fears Banquo because he suspects Macbeth of murder, a suspicion rooted in Macbeth’s promise of future kingship. The ghost amplifies Macbeth’s isolation, signaling that his guilt transforms suspicion into self-accusation. This psychological dimension enriches the play’s exploration of power and accountability.

Macduff’s Investigation and the Path to Accountability

Macduff actively investigates Duncan’s death, aligns with Malcolm to oppose Macbeth, and ultimately uncovers the truth through prophecy and confrontation. His loyalty to Duncan and suspicion of Macbeth drive much of the play’s latter action. Unlike earlier speculation, Macduff’s investigation is methodical, supported by the witches’ equivocations and the growing resistance across Scotland, culminating in Macbeth’s defeat.

Historical Context and Source Material

Shakespeare adapts Holinshed’s Chronicles, which depict Macbeth as a tyrant who kills Duncan in his sleep. While Holinshed’s account treats Macbeth partly as a historical figure, Shakespeare heightens moral ambiguity by emphasizing Macbeth and Lady Macbeth’s psychological transformation. The play’s suspects and evidence reflect Renaissance ideas about guilt, equivocation, and political legitimacy rather than modern forensic standards.

• Primary suspect: Macbeth, the Thane who murders Duncan and becomes king.
• Instigator: Lady Macbeth, who engineers the plot and shields Macbeth from immediate suspicion.
• Alternative suspects: Duncan’s sons, whose flight makes them temporarily suspect, and the Porter, whose jokes invite tangential suspicion.
• Later investigation: Macduff and Malcolm’s inquiry shifts suspicion back to Macbeth, validating the initial, correct suspicion.

The question of who is suspected of killing King Duncan centers on Macbeth as the chief suspect, with Lady Macbeth as the driving conspirator. Shakespeare builds dramatic tension by aligning Macbeth’s ambition with the act of regicide, then exploring suspicion as both external judgment and internal guilt. The play’s endurance lies in its psychological depth and its examination of how suspicion, once correctly placed, can evolve into justice or further tragedy.