Based on the way he's talked in recent interviews I'm wondering if he had a stroke. A lot signs of being a stroke victim. Of course nothing was ever announced regarding this so it's all speculation.

"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea