What happens
After the battle turns against him, Brutus recognizes that his time has come. He asks his companions to help him take his own life, but they refuse. Finally, Strato agrees to hold his sword while Brutus runs upon it. As Brutus dies, he addresses Caesar, saying he kills himself with more willingness than he killed Caesar. Octavius and Antony discover his body and praise him as the noblest Roman, ordering him buried with full military honors.
Why it matters
Brutus's death completes the tragic arc begun by Caesar's murder. Where Caesar fell surrounded by friends who betrayed him, Brutus falls with loyal men who refuse to betray him—yet he must force one of them to assist in his suicide. The Ghost of Caesar, which appeared twice to warn Brutus, has now claimed its due. Brutus's final words—'Caesar, now be still: I kill'd not thee with half so good a will'—reveal the deepest irony: he killed Caesar reluctantly, to save Rome, but kills himself willingly, accepting defeat. His suicide is not cowardice but a Roman's final assertion of control over his fate, a refusal to be paraded as a captive.
The scene's closing judgment, delivered by Antony himself, transforms Brutus from conspirator into hero: 'This was the noblest Roman of them all.' Antony recognizes what the earlier action obscured—that Brutus alone acted from honest principle, not envy. The play's central tragedy lies here: the man most motivated by love of Rome, most careful in his reasoning, most bound by honor, becomes the instrument of Rome's civil war and his own destruction. Caesar's victory in death proves absolute. The conspirators who killed him to prevent tyranny have instead unleashed the very chaos they feared, and the noblest among them pays with his life.