I still think it was the ex boyfriend. I also think it's suspicious that investigators are so dismissive of him being a suspect. I mean just how solid is his alibi? There's no way they could have determined at this point that he didn't hire someone to do it. It would take months to come to that conclusion, after all stones are turned and all possible contacts are interviewed. They're just like, 'nope, wasn't him'. Weird.

"...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