Possible Clues:

• Repeatedly about to arrest singular plotter against Caesar
• One of Caesar's murderers had to get an R.A. to get one in motion
• Conspirator in 'Julius Caesar'
• "Julius Caesar" role
• 'Envious' assassin of Caesar
• "Speak, hands, for me!" speaker
• Co-conspirator with Brutus and Cassius
• Who says 'Speak, hands, for me!' in 'Julius Caesar'
• Caesar's first stabber
• Accomplice of Brutus