How did innocent looking teenager, Gary Campion, mature into a contract killer by the age of 17? Is he representative of a new-breed of killer? What differentiates Campion from the gun-men of his older generation? Guilty of not one, but two gangland assassinations, is Gary Campion, the most notorious assassin in Irish organised crime? Step forward the teenage hitmen - children blooded early to commit murder for money. The most notorious is Gary Campion. The only person convicted and serving time for two gangland hits. The episode looks at the murder of Brian Fitzgerald and Campion's role and the ensuing investigation. It also looks at Campion's upbringing and fledgling career before blooming into a hit-man for hire.