Key points:- Messina Denaro was sentenced in absentia in 1992 for his role in the murders of two anti-mafia prosecutors- He also faces a life sentence for his role in bomb attacks that killed 10 peopleHe once helped kidnap a boy in an attempt to dissuade his father from giving evidence, later murdering the childProsecutors say Messina Denaro is a boss of Sicily's Cosa Nostra mafia.Messina Denaro — who comes from the small town of Castelvetrano near Trapani — is accused by prosecutors of being solely or jointly responsible for numerous other murders in the 1990s.Italy's Mafia boss who set the record for the longest time on the lam was Bernardo Provenzano, captured in a farmhouse near Corleone, Sicily, in 2006 after 38 years as a fugitive.Once Provenzano was in police hands, the hunt focused on Messina Denaro, but despite numerous reported sightings of the boss, he managed to elude arrest, until Monday.Law enforcement have long said that such bosses rely on contacts and confidentiality of fellow mobsters and complicit family members to move the fugitives from hideout to hideout, supply basic needs, like food and clean clothing and communication, and a code of silence known as "omerta.""