Bascially what's been said here on this thread pretty well sums up Accardo's last few years. He moved in with his daughter approximately two yrs. before his death.

He was under surveillance for practically all but the last year or so (not sure about this). Probably the FBI plus a few close friends and associates, and family, would know for sure about when he became totally inactive. He was extremely cautious, and maybe even paranoid, about meeting with other Outfit members.