As capo mandamento he became a member the Commission, the coordinating body of Cosa Nostra in Sicily, in 1974. He was initially close to other important heroin traffickers such as Stefano Bontade, Salvatore Inzerillo and Gaetano Badalamenti who opposed the rising power of Salvatore Riina and his Corleonesi. He tried to keep a neutral position, but became more and more isolated, trusting his alliance with the head of the Commission Michele Greco, who, however, secretly sided with the Corleonesi. During the Second Mafia War that broke out in 1981 with the murder of Bontade and Inzerillo, Riccobono expediently sided with the Corleonesi. He lured a number of Stefano Bontade's friends to their deaths on behalf of Riina. Those that went along, such as Emanuele D’Agostino, were never seen again. One of the men he tried to ensnare was Salvatore Contorno, but Contorno was suspicious and fled into hiding. He subsequently went on to become a pentito, cooperating with the government.
Killed by the Corleonesi
However, turning against his former allies made Riccobono an untrustworthy man and Riina decided to turn against him after he had taken care of Bontade and Inzerillo. Unlike with other Mafia families, Riina had never succeeded in infiltrating the Mafia family of Riccobono with men loyal to the Corleonesi. Riina was not able to control Riccobono and needed the charismatic boss out of the way, not in the least to reward his other allies in Palermo with parts of Riccobono’s territory. Riccobono and eight of his men vanished without trace at the end of November 1982. The men were separated off from each other at a dinner at Michele Greco’s estate and strangled one by one by their table companions. Riccobono was just taking his after-dinner nap. Three of his associates were gunned down a few days later and his brother, Vito Riccobono, was found decapitated in his car. Within a few days Riccobono’s entourage was eliminated. One of the few who survived was Riccobono’s erstwhile driver Salvatore Lo Piccolo, who rose to power twenty years later. For a while the Italian media blamed another foe of Riina, Tommaso Buscetta, as being responsible for wiping out the Riccobono cosca, as revenge for the recent slayings of Buscetta's two sons. In fact Buscetta had nothing to do with the killing of Riccobono and his men; he was hiding out in Brazil at the time. A number of informants have said that Pino Greco was the man who personally garrotted Riccobono and subsequently orchestrated the murders of a dozen of Riccobono's associates and relatives. Rosario Riccobono was given an in absentialife sentence at the Maxi Trial even though he was dead by then. Rumours of his death emerged in the mid-1980s but were not confirmed until the end of that decade through the informant Francesco Marino Mannoia. His body has never been found.
Caravaggio
At one point, Riccobono was believed to have been in the possession of Caravaggio's Nativity with St. Francis and St. Lawrence, one of the most famous stolen pieces of artwork.
