Despite initially being a supporter of Caesar, Casca and his brother (whose name is unknown) joined in the assassination. Casca struck the first blow, attacking Caesar from behind and hitting his bare shoulders, after
Tillius Cimber had distracted the dictator by grabbing his toga. Caesar replied "Casca, you villain, what are you doing?" and tussled with him for several seconds. Casca simultaneously shouted to his brother in Greek, "Brother, help me!" The other assassins then joined in. In December 44 BC, Casca assumed office as
plebeian tribune. No unrest was associated with his taking office and he allied himself with
Cicero and Brutus' mother
Servilia. However, after
Octavian marched on Rome during the
War of Mutina, Casca fled the city and joined
Marcus Junius Brutus and
Gaius Cassius Longinus, the leaders of the assassins, in the
Liberators' civil war against the
Second Triumvirate of Antony, Lepidus, and Octavian. When he fled the city, his colleague,
Publius Titius, had Casca's tribunate abrogated. He seems to have died, probably by suicide, in the aftermath of their defeat at the
Battle of Philippi, in October 42 BC. There is no reference to him in any of the sources after this date.
Elmley Lovett in England is the place where a coin hoard was found to include a rare Roman Republican silver denarius of Brutus with Casca Longus struck at a mint moving with Brutus 43-42 BC.
A house containing a table inscribed with his name is found in
Pompeii. ==Dramatic depictions==