He died famously when he ordered a servant to stab him under the misapprehension that the Battle of Philippi had been lost.  
After defeat, he led the shattered legions out of Parthia and spent the next few years warding off Parthian invasions and suppressing a revolt in Judea.  A one-time ally of Pompey, he was pardoned in 47 BC and in 44 BC became praetor peregrinus, but his noteworthy deeds arose after his younger brother-in-law was given the more prestigious post of praetor urbanus.  He died famously when he ordered a servant to stab him under the misapprehension that the Battle of Philippi had been lost.  FTP, name this possessor of a "lean and hungry look," who died after successfully plotting with his brother-in-law, Brutus, to kill Julius Caesar.
After defeat, he led the shattered legions out of Parthia and spent the next few years warding off Parthian invasions and suppressing a revolt in Judea.  
Caius Cassius Longinus