Short answers, pulled from the story.
Lucius Sergius Catiline was born no later than 108 BC or possibly 106 BC from the ancient patrician gens Sergia. His lineage claimed descent from Sergestus, a Trojan companion of Aeneas, though no member had held the consulship since 429 BC.
During the civil war in 82 BC, Lucius Sergius Catiline joined Sulla's forces as a lieutenant and profited from the proscriptions that followed. Ancient sources claim he became wealthy by killing his brother and two brothers-in-law including Marcus Marius Gratidianus while purchasing estates for fractions of their true value.
On the 6th of November 63 BC, Lucius Sergius Catiline held a secret meeting at Marcus Porcius Laeca's house planning to join Gaius Manlius' army while conspirators set fires in Rome and assassinated Cicero. After Cicero denounced him in the First Catilinarian speech, Catiline left for Massilia claiming voluntary exile when the senate refused his offer of exile.
Lucius Sergius Catiline died possibly on the 3rd of January 62 BC at Pistoria which is modern-day Pistoia after offering battle to Antonius' army. His army of perhaps three thousand men melted away after coconspirators in Rome were executed without trial on the 5th of December.
In Roman literature, Lucius Sergius Catiline became a byword for villainy with Virgil depicting him tortured in the underworld by Furies in the Aeneid written during Augustus's reign. Modern reassessments include Edward Spencer Beesly's 187 work and dramatists like Ben Jonson who wrote Catiline His Conspiracy in 1611 while Steven Saylor published Catilina's Riddle in 1993.