Corky Romano is a bumbling, simpleton, veterinarian and the youngest, outcast son of an aging gangster, named Pops Romano, who calls upon Corky to infiltrate the local FBI and retrieve and destroy evidence being used to incriminate Pops for racketeering charges.
Not on screen but yes it is implied the killer is biting genitalia off of people so one might feel as this is cannibalistic behavior, I think it is assumed, it's been years since I saw this movie
It's either a massive stroke or a heart attack, in the very beginning of the movie. Later his dead is faked to force a confession of guilt by a criminal.