Francesco Raccosta, who disappeared in March 2012, was severely beaten before being thrown to a drove of pigs, Il Fatto Quotidiano reported.
His fate was only recently discovered thanks to a police investigation into the southern ‘Ndrangheta mafia.
In a wiretap, police overheard 24-year-old Simone Pepe boasting about Raccosta’s gruesome end, the newspaper said.
“It was satisfying to hear his screams. Mamma mia how he screamed!...In the end I didn’t see anything...nothing remained!” Pepe said.
The murder was thought to be in revenge for Raccosta killing another mafia boss, in a feud which dates to the 1950s, Il Fatto said.