First we lost Tony Soprano. Now we've lost his dad. Joseph Siravo, who played Giovanni Francis "Johnny Boy" Soprano on five flashback episodes of "The Sopranos," has died at the age of 66. He had been battling cancer since 2017. James Gandolfini of Park Ridge, who played his on-screen son, died of a heart attack in 2013. "Joe was an excellent actor and a wonderful guy and he will be missed dearly," actor Michael Imperioli (Christopher Moltisanti) said on Instagram. "Until the next life my friend." Though "Johnny Boy" Soprano was not a series regular, he was a key figure in the iconic HBO crime drama — which, after all, deals with the various mental hang-ups of suburban mobster Tony Soprano, as unpacked in the psychiatrist's office of Dr. Jennifer Melfi (Lorraine Bracco). A great many of those problems, naturally, had to do with his mother, the diabolical Livia (Nancy Marchand, who died in 2000, early in the run of the show) and his father, crime kingpin "Johnny Boy" Soprano.